Cellular morphology of cocultured cells. Wright-Giemsa–stained cytospins of hematopoietic cells cocultured withWnt-expressing feeder cells (A) and with feeder cells transduced with the MSCVneoEB vector (B). All Wnt-expressing cocultures contained similar cellular morphology (data not shown) and are represented by a single sample. Arrows indicate nucleoli within the nucleus of stained cells. Cells were photographed under phase-contrast using a 63× objective.