Bouwman, P.

sp 3 / embryo factor expression transcription wild-type protein figure development liver mouse erythroid fragment domain sp 3–/– mice liver cells knockout analysis sp 4null mice suske defect blood lineage ±/± transcription factors promoter activation family glutamine-rich activation domains hematopoietic 18.5 function number lacz cells t-cell myeloid stage thymu tissue sp 4 gene plasmid 4null 3–/– vivo transplantation assay absence allele erythrocyte transplantation erythroid cells t-cell development probe birth clone anti-cd organ vector 3-deficient differentiation hagen encoding analyses formation growth sequence repopulation sp 42/± mice precursor result culture b-cell q blackwell science hematopoiesi value delay wild-type mice lacz expression section b cells myeloid lineages transcript