[siˈnæpsis]
①〔染色体〕联会，接合：减数分裂前期的最初阶段，精原核与卵原核的同源染色体(即大小、形状和内容相似的一对染色体)逐点联合配对的现象；②突触- 1,3-bisphosphoglycerate
- 1,4-α-glucan branching enzyme
- 17-hydroxycorticosteroid
- 17-hydroxycorticosterone
- 17-hydroxysteroid
- 2,3-bisphosphoglycerate
- 2,3-diphosphoglycerate
- 2,4,5-T
- 2,4-D
- 2,4-dichlorophenoxyacetic acid
- 2,5-dimethoxy-4-methylamphetamine
- 25-hydroxycholecalciferol
- 25-hydroxyergocalciferol
- 2-acylglycerol O-acyltransferase
- 2-aminoadipate transaminase
- 2-aminoethanol
- 2-deoxy-D-glucose
- 2-oxoglutaric acid
- 2-oxoisovalerate dehydrogenase (lipoamide)
- 2-PAM
- 2-phosphoglycerate
- 2-phosphoglyceric acid
- 3,4-benzpyrene
- 3,4-dihydroxyphenylalanine
- 3,4-dimethoxyphenylethylamine