Fig. 1.
Morphology of MPRO cells during differentiation.
MPRO cells were induced as described in “Materials and methods,” concentrated by cytospin, and Wright-Giemsa stained. (A) Uninduced MPRO cells. (B) MPRO cells induced with ATRA for 24 hours. (C) MPRO cells induced with ATRA for 48 hours. (D) MPRO cells induced with ATRA for 72 hours.