hemoprotein: a conjugated protein linked to a compound of iron and porphyrin
chemical: material produced by or used in a reaction involving changes in atoms or molecules
tardigrada: in some classifications considered a separate phylum: microscopic arachnid-like invertebrates living in water or damp moss having 4 pairs of legs and instead of a mouth a pair of stylets or needlelike piercing organs connected with the pharynx