Multiple Assemblies exist for SMTL entry 2x4q
Crystal structure of MHC CLass I HLA-A2.1 bound to a photocleavable peptide; X-RAY DIFFRACTION 1.90 Å

	SMTL ID 2x4q.1 Ligands HLA-A2.1-RESTRICTED INFLUENZA A MATRIX EPITOPE; 2-(N-MORPHOLINO)-ETHANESULFONIC ACID Polypeptides HLA CLASS I HISTOCOMPATIBILITY ANTIGEN, A-2.1; BETA-2-MICROGLOBULIN Oligo-state hetero-1-1-mer
	SMTL ID 2x4q.2 Ligands HLA-A2.1-RESTRICTED INFLUENZA A MATRIX EPITOPE; 2-(N-MORPHOLINO)-ETHANESULFONIC ACID; GLYCEROL Polypeptides HLA CLASS I HISTOCOMPATIBILITY ANTIGEN, A-2.1; BETA-2-MICROGLOBULIN Oligo-state hetero-1-1-mer