constitute a regulatory subunit of the complex. On the ground of their primary structure they are divided into two classes A and B, both necessary for the . activates histone H1 kinase and becomes destroyed by earlier than and plays an important role in the . A and B may be involvent in the development of either directly inappropriate expression of the cyclin A gene caused by hepatitis B virus in hepatocellular carcinoma, or interactions of this cyclin with factors paricipating in the regulation of cell proliferation or indirectly by phosphorylation of some oncogene or antioncogene proteins by a cdk (cyclin dependent kinase).
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