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protonotary
protoplanet
protoplasm
protoplast
protoporphyrin
protostar
protostome
prototherian
prototrophic
prototype
protoxide
protozoan
protozoology
protozoon
protract
protracted
protractile
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prototrophic
pro·to·tro·phic [ prtō trṓfik, prtə tróffik ]


adjective 
Definition:
 
needing same nourishment: describes a microorganism that has the same nutritional needs and metabolic characteristics as the wild parent strain

pro·to·troph [ prṓtə trf, prṓtə tròf ] noun
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