Chains and heterogens:
PDB Chain Sequences:
>1tgn_ (-) vggytcgantvpyqvslnsgyhfcggslinsqwvvsaahcyksgiqvrlgedninvvegn eqfisasksivhpsynsntlnndimliklksaaslnsrvasislptscasagtqclisgw gntkssgtsypdvlkclkapilsdsscksaypgqitsnmfcagyleggkdscqgdsggpv vcsgklqgivswgsgcaqknkpgvytkvcnyvswikqtiasn