所屬欄目:腫瘤轉(zhuǎn)移
染色質(zhì)(chromatin)是指間期細(xì)胞核內(nèi)伸展開來的DNA-蛋白質(zhì)纖維。染色質(zhì)分常染色質(zhì)(euchromatin)與異染色質(zhì)(heterochromatin)兩種,常染色質(zhì)是解旋的細(xì)纖維絲,位于細(xì)胞核中央,染色淺,可進(jìn)行復(fù)制與轉(zhuǎn)錄;異染色質(zhì)是間期或分裂前期核內(nèi)染色很深 ......(本文共 277 字 ) [閱讀本文] >>