Crossword Genius

Monkey; — factor (6)

Ross

I believe the answer is:

rhesus

(Other definitions for rhesus that I've seen before include "Monkey - factor in blood cell problem" , "(Kind of monkey) used in medical experiments" , "King, in Greek mythology" , "Small, long-tailed monkey" , "Small Indian monkey" .)

I've seen this clue in The Times.
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