The Oxygen-Binding Protein in Muscle Cells

This page is the CodyCross answer for the clue below from Trip to Spain, Group 851, Puzzle 3 (Penelope Cruz).

Question is: The Oxygen-Binding Protein in Muscle Cells

and the answer is: MYOGLOBIN

Word Meaning:

MYOGLOBIN — (biochemistry) A small globular protein, containing a heme group, that carries oxygen to muscles.

Definitions from Wiktionary.