Chains and heterogens:
PDB Chain Sequences:
>1ffnA (A:) phsmryfetavsrpgleepryisvgyvdnkefvrfdsdaenpryeprapwmeqegpeywe retqkakgqeqwfrvslrnllgyynqsaggshtlqqmsgcdlgsdwrllrgylqfayegr dyialnedlktwtaadmaaqitrrkweqsgaaehykaylegecvewlhrylkngnatllr tdspkahvthhprskgevtlrcwalgfypaditltwqlngeeltqdmelvetrpagdgtf qkwasvvvplgkeqnytcrvyheglpepltlrw
>1ffnB (B:) miqktpqiqvysrhppengkpnilncyvtqfhpphieiqmlkngkkipkvemsdmsfskd wsfyilahteftptetdtyacrvkhdsmaepktvywdrdm
>1ffnD (D:) phsmryfetavsrpgleepryisvgyvdnkefvrfdsdaenpryeprapwmeqegpeywe retqkakgqeqwfrvslrnllgyynqsaggshtlqqmsgcdlgsdwrllrgylqfayegr dyialnedlktwtaadmaaqitrrkweqsgaaehykaylegecvewlhrylkngnatllr tdspkahvthhprskgevtlrcwalgfypaditltwqlngeeltqdmelvetrpagdgtf qkwasvvvplgkeqnytcrvyheglpepltlrw
>1ffnE (E:) miqktpqiqvysrhppengkpnilncyvtqfhpphieiqmlkngkkipkvemsdmsfskd wsfyilahteftptetdtyacrvkhdsmaepktvywdrdm