PAICU Petra Acquisition Inc

QUESTIONS AND ANSWERS ABOUT THESE PROXY MATERIALS, VOTING AND NEW PROPOSAL 3

Why did I receive this Supplement?

After the mailing of the Notice, the Board of Directors determined to recommend an additional proposal for stockholder approval at the Annual Meeting. This Supplement is being delivered to you by mail as a stockholder of record, as of May 5, 2023, of the Company to provide you with information about the additional proposal to be voted on by the stockholders to ratify Baker Tilly US LLP as the Company’s independent auditor for the fiscal year ending December 31, 2023. This Supplement will be mailed on or about June 15, 2023 to our stockholders of record on the record date.

How do I attend the Annual Meeting?

The Annual Meeting will be a virtual meeting only and will be held via a Zoom videoconference. Stockholders will not be able to physically attend the meeting. The virtual meeting can be accessed by using the following link:

https://us02web.zoom.us/j/83739715773?pwd=d0s1K0JaODhjU1MycmY4Y3VULzJ3QT09

Any stockholder who is unable to join the online meeting can participate by telephone by dialing (929) 205-6099 and using the Zoom Meeting ID 837 3971 5773 and the Passcode 177108.

Who can vote at the Annual Meeting?

Only stockholders of record at the close of business on May 5, 2023 will be entitled to vote at the Annual Meeting. On this record date, there were 5,773,983 shares of common stock outstanding and entitled to vote.

Stockholder of Record: Shares Registered in Your Name

If on May 5, 2023 your shares were registered directly in your name with the Company’s transfer agent, Continental Stock Transfer & Trust Company, then you are a stockholder of record. As a stockholder of record, you may vote in person at the meeting or vote by proxy. Whether or not you plan to attend the meeting, we urge you to vote by proxy to ensure your vote is counted.

Beneficial Owner: Shares Registered in the Name of a Broker or Bank

If on May 5, 2023 your shares were held, not in your name, but rather in an account at a brokerage firm, bank, dealer or other similar organization, then you are the beneficial owner of shares held in “street name” and received a Notice from that organization. The organization holding your account is considered to be the stockholder of record for purposes of voting at the Annual Meeting. As a beneficial owner, you have the right to direct your broker or other agent regarding how to vote the shares in your account. You are also invited to attend the Annual Meeting. However, since you are not the stockholder of record, you may not vote your shares in person at the meeting unless you request and obtain a valid proxy from your broker or other agent.

What am I voting on?

There are three matters scheduled for a vote:

What if another matter is properly brought before the meeting?

The Board of Directors knows of no other matters that will be presented for consideration at the Annual Meeting. If any other matters are properly brought before the meeting, it is the intention of the persons named in the proxy to vote on those matters in accordance with their best judgment.

How do I vote?

Stockholder of Record: Shares Registered in Your Name

Your proxy card shows the number of shares of our common stock that you own.

You can vote your shares in advance of the Annual Meeting by completing, signing, dating and returning the enclosed proxy card in the postage-paid envelope provided. If you hold your shares in “street name” through a broker, bank or other nominee, you will need to follow the instructions provided to you by your broker, bank or other nominee to ensure that your shares are represented and voted at the Annual Meeting. If you vote by proxy card, your “proxy,” whose name is listed on the proxy card, will vote your shares as you instruct on the proxy card. If you sign and return the proxy card but do not give instructions on how to vote your shares, your shares of our common stock will be voted as recommended by our board of directors. Our board of directors recommends voting “FOR” each of the nominees to serve as Class A director for a three-year term, the proposal to amend the 2021 Equity Incentive Plan and to ratify the appointment of Baker Tilly US, LLP as the Company’s independent auditor for the fiscal year ending December 31, 2023.

You can attend the Annual Meeting and vote telephonically even if you have previously voted by submitting a proxy. However, if your shares of common stock are held in the name of your broker, bank or other nominee, you must get a proxy from the broker, bank or other nominee. That is the only way we can be sure that the broker, bank or nominee has not already voted your shares of common stock.

Beneficial Owner: Shares Registered in the Name of a Broker or Bank

If you are a beneficial owner of shares registered in the name of your broker, bank, or other agent, you should have received a Notice containing voting instructions from that organization rather than from Revelation Biosciences, Inc. Simply follow the instructions in the Notice to ensure that your vote is counted. To vote in person at the Annual Meeting, you must obtain a valid proxy from your broker, bank or other agent. Follow the instructions from your broker or bank included with these proxy materials, or contact your broker or bank to request a proxy form.

How many votes do I have?

On each matter to be voted upon, you have one vote for each share of common stock you own as of May 5, 2023.

What if I return a proxy card or otherwise vote but do not make specific choices?

If you return a signed and dated proxy card or otherwise vote without marking voting selections, your shares will be voted, as applicable, “For” each of the nominees to serve as Class A director for a three-year term, the proposal to amend the 2021 Equity Incentive Plan and to ratify the appointment of Baker Tilly US, LLP as the Company’s independent auditor for the fiscal year ending December 31, 2023. If any other matter is properly presented at the meeting, your proxyholder (one of the individuals named on your proxy card) will vote your shares using his or her best judgment.

What should I do if I have already voted?

In order to vote on Proposal 3, you must sign and return the revised proxy card enclosed with this Supplement, vote as described above or attend the Annual Meeting and vote in person. If you have already completed and returned the original proxy card previously sent to you and you also complete and return the enclosed revised proxy card, the completed and signed revised proxy card will replace the original proxy card in its entirety and only your vote as indicated on the revised proxy card will be counted. This means that, in order to vote with respect to all three proposals, you must vote again on Proposals 1 and 2 in addition to voting on Proposal 3.

If you have already completed and returned the original proxy card and you do not complete and return a signed revised proxy card, your vote on Proposals 1 and 2 as indicated on the original proxy card will be voted at the Annual Meeting, but you will not have a recorded vote with respect to Proposal 3. Therefore, we urge you to cast your vote with respect to all proposals using the revised proxy card enclosed with this Supplement or one of the other methods described above.

Who is paying for this proxy solicitation?

The Company first mailed definitive copies of this proxy statement on May 8, 2023 and anticipates first mailing definitive copies of this Supplement on or about June 15, 2023. Revelation Biosciences, Inc. is asking for your proxy and will pay all of the costs associated with asking for stockholders’ proxies for the 2023 Annual Meeting. In addition to the use of the mail, proxies may be solicited by the Directors, officers and employees of Revelation Biosciences, Inc. by personal interview, telephone or otherwise. The Company has also retained Advantage Proxy, Inc., a proxy soliciting firm, to solicit proxies for the Annual Meeting, at a cost of $10,000, plus disbursements. Directors, officers and employees will not be additionally compensated, but may be reimbursed for out-of-pocket expenses in connection with solicitation. Arrangements also will be made with brokerage houses and other custodians, nominees and fiduciaries for the forwarding of solicitation material to Street Name Holders, and Revelation Biosciences, Inc. will reimburse custodians, nominees and fiduciaries for reasonable out-of-pocket expenses in connection with the forwarding of solicitation material.

Who can help answer my questions?

If you have questions about the proposals or if you need additional copies of this proxy statement/prospectus or the enclosed proxy card you should contact our proxy solicitor at:

Advantage Proxy, Inc.

PO Box 10904

Yakima, WA 98909

Toll Free Phone: 1-877-870-8565

Collect: 1-206-870-8565

Email: ksmith@advantageproxy.com

To obtain timely delivery, Revelation Biosciences, Inc. stockholders must request the materials no later than five (5) business days prior to the Annual Meeting. You may also obtain additional information about Revelation from documents filed with the SEC by following the instructions in the section titled “Where You Can Find More Information.”

PROPOSAL 3

Our board of directors has selected Baker Tilly US, LLP to audit our financial statements for the fiscal year ending December 31, 2023. Baker Tilly US, LLP has audited our financial statements since fiscal year 2020.

Although stockholder approval of the selection of Baker Tilly US, LLP is not required by law, our board of directors believes it is advisable to give stockholders an opportunity to ratify this selection. If this proposal is not approved at the Annual Meeting, the board of directors may reconsider its selection of Baker Tilly US, LLP.

(a) Audit fees represent fees for professional services provided in connection with the audit of the Company’s annual financial statements and the review of its financial statements included in the Company’s Quarterly Reports on Form 10-Q and services that are normally provided in connection with statutory or regulatory filings.

(b) Tax fees represent fees for professional services related to tax compliance, tax advice and tax planning.

(c) Other fees represent fees related to our filing of certain Registration Statements.

Pre-Approval Policies and Procedures

All audit related services, tax services and other services rendered by Baker Tilly US, LLP were pre-approved by the Company’s Board of Directors. Commencing in 2020, the Audit Committee was charged with all pre-approval activities with respect to the Company’s independent registered public accounting firm. The Audit Committee has adopted a pre-approval policy that provides for the pre-approval of all services performed for the Company by its independent registered public accounting firm. Our independent registered public accounting firm and management are required to periodically report to the Audit Committee regarding the extent of services provided by the independent registered public accounting firm in accordance with this pre-approval policy, and the fees for the services performed to date.

Interests of Officers and Directors in this Proposal

Our officers and directors do not have any substantial interest, direct or indirect, in in this proposal.

Required Vote of Stockholders

The affirmative vote of a majority of the votes cast at the Annual Meeting is required to ratify the appointment of the independent registered public accounting firm.

Board Recommendation

The board of directors unanimously recommends a vote “FOR” the ratification of the appointment of Baker Tilly US, LLP as our independent registered public accounting firm.