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- 开胃素AOrexin A
- 兔脑和脊髓内开胃素A免疫阳性神经元和神经纤维的分布Distribution of Orexin A-like immunoreactive neurons and nervous fibers in the brain and spinal cord of rabbit
- 桑素Amoracin A(植物抗真菌抗生素)
- 碳霉素AcarbomycinA
- 头霉素ACephamycin A
- 涂霉素AHehxin
- 狭霉素Aangustmycin A
- 仙茅素AcurculigineA
- 粘附素Aadhesion A
- 血栓素Athromboxane A; TxA
- 天蚕素Acecropin A
- 越霉素ADestomycin A; Destonate 20
- 嗜铬素Achromogranin A
- 粘菌素AColistin A
- 脂氧素Alipoxin A; LXA
- 醉茄素Awithaferin A
- 轭霉素AZM-A; zygomycin A
- 醌霉素Alevomycin
- 激活素AActivin A
- 印楝素Aazadirachtin A
