[ˌhetərəuˈkrəumətin]
异染色质：染色质着色深，蟠曲紧，分裂间期在细胞核内形成不规则的块状即核体(karyosomes)或性染色质(Barr bodies)；或指有丝分裂的染色体上某些着色深的区域。参见euchromatin项下
习惯用语constitutive heterochromatin
结构性异染色质：染色体上呈恒定异染区的染色质，常位于第1，9和16染色体的次隘痕处，Y染色体长臂的远端和着丝粒及端粒区。所含高度重复的DNA序列，在遗传上无作用，只是染色体的一种结构成分。见banding项下的C bandingfacultative heterochromatin
功能性异染色质，兼性异染色质：在某些组织及细胞内染色体上变为异染区的染色质，如女性体细胞内灭活的X染色体- succagogue
- succedaneous
- succedaneum
- succenturiate
- succinate
- succinate-Co A ligase(GDP-forming)
- succinate dehydrogenase
- succinic acid
- Succinimonas
- Succinivibrio
- succinoresinol
- succinous
- succinyl
- succinylcholine chloride
- succinyl-Co A
- succinyl-Co A synthetase
- succinylcoenzyme A
- succinylsulfathiazole
- succorrhea
- succus
- succussion
- sucholoalbumin
- suckle
- Sucostrin
- Sucquet-Hoyer anastomosis(canal)