Elsässer, H.P.

sp 3–/– mice protein transcription wild-type factor embryo mouse 3–/– expression figure knockout suske domain glutamine-rich activation domains tissue fragment 18.5 development function wild-type mice transcription factors section analysis activation teeth layer e 18.5 embryos sp 3-de mice promoter odontoblast tooth enamel clone ameloblastin tooth development family dentin amelogenin product ameloblast sp 3 gene stage dentin /enamel layer sequence birth histological figure 1 dennig hagen disruption pbs-p-b fi lters caesarian section lung tissue membrane allele activator defect transcriptional post-natal analyses formation space arrow material tuftelin sp 3-de embryos failure transcript histological sections ͼ11 kbp fragment member plasmid lethality fication nylon membranes identi fication speci presence es cells