A smear of bands was observed. A genomic library of mouse embryo constructed with Charon 4A phage was screened with MS3 cDNA probe.

• 在供试的全部分化细胞株,即TDM_1、PSA_1-2、3/A/1-D3、C_(17)-S_1-T(284)中,均查不到MS_3RNA。