Spec
If you are a stem-seller (pun intended) then you could also look at MMG which
is in deep doo-dahs at the moment. Its 26% stake in Cellfactors (at 25p)would notionally be worth about £6m alone whereas MMG's MarketCap is now £3.61m. Prob is that the Cellfactors funding @25p did not get away just recently and so there is a lot of uncertainty over both companies. Cellfactors is still private but the interesting thing about this outfit is that the immortalisation of cells although difficult is perhaps not the primary problem. This might in fact be the ability to bump off stem cells when/if as transplants they get out of control in the body of the patient. CellF have patents and method of killing such cells which I think is unique and patented.
I hold neither company but have always given them a close look.