体节前胚胎：指体节出现前的胚胎；在人类为第九期(Horizon Ⅸ)之前或受精后19天- acetaldehyde dehydrogenase
- acetaldehyde reductase
- acetamide
- acetamidine
- acetaminophen
- acetanilid
- acetarsol
- acetarsone
- acetas
- acetate
- acetate-CoAligase
- acetazolamide
- acetenyl
- Acetest
- aceteugenol
- acetic
- acetic acid
- aceticoceptor
- acetify
- acetimeter
- acetin
- Acetivibrio
- acetoacetic acid
- acetoacetyl-CoA
- acetoacetyl-CoA reductase