    New chain ID            Original chain ID

13gm_1-pdb-bundle1.pdb:
           A                        C1
           B                        C2
           C                        C3
           D                        C4
           E                        C5
           F                        C6
           G                        C7
           H                        C8
           I                        C9
           J                       C10
           K                       C11
           L                       C12
           M                       C13
           N                       C14
           O                       C15
           P                       C16
           Q                       C17
           R                       C18
           S                       C19
           T                       C20
           U                       C21
           V                       C22
           W                       C23
           X                       C24
           Y                       C25
           Z                       C26
           a                       C27
           b                       C28
           c                       C29
           d                       C30
           e                       C31
           f                       C32
           g                       C33
           h                       C34
           i                       C35
           j                       C36
           k                       C37
           l                       C38
           m                       C39
           n                       C40
           o                       C41
13gm_1-pdb-bundle2.pdb:
           A                       C41
           B                       C42
           C                       C43
           D                       C44
           E                       C45
           F                       C46
           G                       C47
           H                       C48
           I                       C49
           J                       C50
           K                       C51
           L                       C52
           M                       C53
           N                       C54
           O                       C55
           P                       C56
           Q                       C57
           R                       C58
           S                       C59
           T                       C60
           U                       C61
           V                       C62
           W                       C63
           X                       C64
           Y                       C65
           Z                       C66
           a                       C67
           b                       C68
           c                       C69
           d                       C70
           e                       C71
           f                       C72
           g                       C73
           h                       C74
           i                       C75
           j                       C76
           k                       C77
           l                       C78
           m                       C79
           n                       C80
           o                       C81
13gm_1-pdb-bundle3.pdb:
           A                       C81
