Anti-myosin, heavy chain 11, smooth muscle antibodies are used in antigen-specific immunodetection in biological samples. The target myosin, heavy chain 11, smooth muscle is a known alias name of the protein myosin heavy chain 11, encoded by the MYH11 gene in humans. This 1972-amino acid residue protein is known to be involved in muscle contraction, among other biological processes. It is reported to be expressed in the skin, ovary, endometrium, duodenum, and breast. Other synonyms for myosin, heavy chain 11, smooth muscle include AAT4, FAA4, and SMHC.