Cyclin B1(CCNB1) Homo sapiens The protein encoded by this gene is a regulatory protein involved in mitosis. The gene product complexes with p34(cdc2) to form the maturation-promoting factor (MPF). Two alternative transcripts have been found, a constitutively expressed transcript and a cell cycle-regulated transcript, that is expressed predominantly during G2/M phase. The different transcripts result from the use of alternatetranscription initiation sites.

CCNB1; CCNB; G2/mitotic-specific cyclin-B1