3A). (20 g for total RNA) were electrophoresed through formaldehyde-agarose gels and transferred to a nylon membrane (Hybond N, Amersham). Membranes were hybridized with 32P-labeled murine -casein, Id-1 and Id-2 cDNA probes (6). Membranes were washed and exposed to XAR-5 film for autoradiography. 28S and 18S ribosomal RNA are shown Continue Reading