Chains and heterogens:
PDB Chain Sequences:
>1lvl_ (-) qqtiqttlliigggpggyvaairagqlgiptvlvegqalggtclnigcipskalihvaeq fhqasrftepsplgisvasprldigqsvawkdgivdrlttgvaallkkhgvkvvhgwakv ldgkqvevdgqriqcehlllatgsssvelpmlplggpvisstealapkalpqhlvvvggg yiglelgiayrklgaqvsvvearerilptydseltapvaeslkklgialhlghsvegyen gcllandgkggqlrleadrvlvavgrrprtkgfnlecldlkmngaaiaidercqtsmhnv waigdvagepmlahramaqgemvaeiiagkarrfepaaiaavcftdpevvvvgktpeqas qqgldcivaqfpfaangramslesksgfvrvvarrdnhlilgwqavgvavselstafaqs lemgacledvagtihahptlgeavqeaalralghalhi