Creb1^tm1Gsc

A promoterless neomycin resistance gene was inserted in frame into exon 2. RNase protection assays on RNA derived from liver of homozyogous mice demonstrated that no detectable alpha or delta isoform transcript was produced from this allele; however, a beta isoform transcript is upregulated (J:31886). Western blot analysis on liver extracts from homozygous mice confirmed that no alpha or delta isoform of the encoded protein was produced. (J:18749, J:31886)