Yes, CYTOCHROME is a Scrabble word!

Letter values in Scrabble US: C 3, Y 4, T 1, O 1, C 3, H 4, R 1, O 1, M 3, E 1.

Is it a valid word?

CYTOCHROME is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

(biochemistry) a class of hemoprotein whose principal biological function is electron transfer (especially in cellular respiration)