CHa ACGTATCGT ACGTATE methylated cytosine me助ation mthated 1106 iiW 5 cytosine CHa TGCATAGCA TGCATAE ACGTATCGT 3 oreced by 3 6 DNA y mainterance maintenan图 TGCATAGCA tepleation methe 简h链 CHa ACGTATCGT ACGTATC 3 ii田 methylation 5 ii册 5 TGCATAGCA TGCATAR 4-68 C