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 alternate transcription initiation sites. [provided
by RefSeq].