EXPRESSION Of cyclin dependent kinase cdk5 and its regulator p35 has b
een shown in the cytoplasm of adult neurons. Here we demonstrate that
another potential regulator of cdk5, cyclin E, is expressed in the ner
vous system and forms complexes with cdk5. Western blot analyses ident
ifies expression of two forms of cyclin E in the mouse nervous system
with the 56 kDa form mainly expressed in neurons and 51 kDa form expre
ssed in astrocytes and oligodendrocytes.