Relative gene expression levels of combined array and QRT-PCR analyses of P4, P5, P6 and P7. Stem cell markers are presented relative to P7 (set at 100). A, stem cell markers: cell surface or secreted factors. B, stem cell markers: transcription factors.
Laslett et al. BMC Developmental Biology 2007 7:12 doi:10.1186/1471-213X-7-12