... mouse cyclin A2 and B1 genes. In the case of mouse cyclin A2, besides the more abun-dant mRNA of 1.8 kb, there is a minor species of 3.0 kb. For mouse cyclin B1 we see in addition to the most ... hybridization. The blot shown wassequentially hybridized with probes of the cyclin A2 coding region,cyclin B1 coding region, cyclin A2 3¢UTR, cyclin B1 3¢UTR andfinally the GAPDH coding region probe. The ... cannot be explainedby half-life changes. It is possible that the majority of the regulation of these transcripts may reside in the choice of polyadenylation site. The lack of changes in mRNA stability...