原囊粘菌属：粘液菌目(Myxobacterales)原囊粘菌科(Archangiaceae)滑行细菌的一属，存在于土壤中。模式菌种为过渡原囊粘菌(A.gephyra)- protoiodide
- protokylol hydrochloride
- Protomastigida
- protomerite
- protometer
- Protominobacter
- Protomonadina
- proton
- protonephridium
- protonephron
- protonephros
- protoneuron
- protonitrate
- proto-oncogene
- Protopam
- protopathic
- protopecten
- protophyllin
- Protophyta
- protophyte
- protophytology
- protopine
- protoplasia
- protoplasm
- protoplasmatic