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Anti-silencing function 1, S.cerevisiae, homolog of A(ASF1A) is a histone chaperone that has a crucial role in the remodeling of chromatin structure during replication, DNA repair, and cellular senescence. It promotes chromation assembly in replication-dependent manner by cooperation with chromation assembly factor1(CAF-1), and cooperates with HIRA in replication-independent manner. It's required forthe fomation of senescence-associated heterochromation foci(SAHF) and efficient senescence-associated cell cycle exit.