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There are 4 ten-letter words beginning with PROTA

PROTAMINESprotamines n. Plural of protamine.
PROTAMINE n. any of a class of simple basic proteins which occur combined with nucleic acids (esp. in fish sperm), also PROTAMIN.
PROTANOPESprotanopes n. Plural of protanope.
PROTANOPE n. a sufferer from protanopia, colour-blindness with respect to red.
PROTANOPIAprotanopia n. (Pathology) A form of color blindness. Involves a defect in distinguishing between red and green.
PROTANOPIA n. colour-blindness with respect to red.
PROTANOPICprotanopic adj. Exhibiting or relating to protanopia.
PROTANOPIC adj. colour-blind to red.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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