Great discussion of MSC's... please read the "Results" & "Discussion" sectors at the beginning of the paper... it suggests that frozen cells delivered via IM right after thawing were cleared in 3 days... however, the same cells allowed to culture overnight prior to IM delivery lasted 3 months... I wonder what protocol PSTI currently utilizes for implantation... I wonder if we could have had a better result with United and the PAH trial if we had used a different protocol for implantation... truly exciting times but certainly not a walk in the park...