The most common and most likely answer to this crossword clue is the 6 letter word MYOSIN
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More clues leading to the result MYOSIN
Buddy explains!
The straight part
We know that "protein" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case protein = myosin.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does MYOSIN mean?
MYOSIN noun- Any of a large family of motor proteins found in eukaryotic tissues, allowing mobility in muscles.
- An albuminous body present in dead muscle formed in the process of coagulation which takes place in rigor mortis.