Chain A ( R1616 Q1617 I1618 W1619 W1620 E1621 L1623 Q1624 R1628 W1633 R1640 E1648 D1649 M1650 R1651 T1652 W1653 L1654 K1655 Y1656 A1657 S1658 L1659 C1660 G1661 K1662 S1663 H1693 P1694 Q1695 V1696 Y1698 A1699 M1701 K1702 W1705 K1706 A1713 F1714 M1717 Q1718 F1720 V1721 M1724 Q1738 H1739 Q1741 E1742 L1743 H1744 K1745 L1746 M1747 A1748 R1749 C1750 F1751 L1752 K1753 L1754 E1756 W1757 Y1775 Y1776 A1779 T1780 H1782 D1783 R1784 S1785 W1786 Y1787 K1788 A1789 W1790 H1791 A1792 Q1886 G1887 F1888 R1890 S1891 I1892 S1893 L1894 S1895 R1896 G1897 N1898 N1899 L1900 D1902 T2207 N2211 D2212 P2213 )