Williams, J.G.

globin xenopu expression mouse analysis adult blood xenopus laevis sequence tissue globin genes tadpole extension animal laevi level primer globin gene fragment extension product transgene acids research william regulation product development control liver stage research evolution chain spleen blot analysis transcript 3- globin genes 15 kb fragment cluster expression system erythroid xenopus globin genes mouse development copy number globin gene clusters xenopus globin expression bt 1 gene pattern 12.5 days gestation event result sequence analysis order injection position expression pattern mouse line mill hill gene cluster mouse oocytes xenopus genes erythroid tissues plasmid vector sequences system locus number primer extension b chains region adult mice 98 bases equivalent subject gene structure mammal b-globin gene gestation 10 kb tadpole blood tail dna