Cystines is valid Scrabble Word

Is cystines a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is cystines valid Words with Friends?
Words with Friends YES

Definitions for CYSTINES in dictionary:

Words related to CYSTINES

cystine12

Similar words containing CYSTINE without suffix s

cystine12
Find what other words can be done using letters: "cystines"
https://scrabble-word.com/finder/cystines
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