plastocyanin

noun
plas·to·cy·a·nin | \ ˌpla-stō-ˈsī-ə-nən \

Definition of plastocyanin 

: a copper-containing protein that acts as an intermediary in photosynthetic electron transport

First Known Use of plastocyanin

1961, in the meaning defined above

History and Etymology for plastocyanin

Greek plastos + English cyan- + -in entry 1

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The first known use of plastocyanin was in 1961

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