TPO fails to affect G-CSF–induced marrow cell colony formation.

Whole femoral marrow cells were obtained from BDF1 mice and plated in methylcellulose cultures containing the indicated concentrations of G-CSF and TPO; the number of CFU-GM–derived colonies on day 5 were enumerated by standard methods. The results reported are for a representative experiment of triplicate cultures; the experiment has been performed on 3 occasions.