Chains and heterogens:
PDB Chain Sequences:
>1v2kT (T:) ivggytcgantvpyqvslnsgyhfcggslinsqwvvsaahcyksgiqvrlgedninvveg neqfisasksivhpsynsetynndimliklksaaslnsrvasislptscasagtqclisg wgntkssgtsypdvlkclkapilsdsscksassfiitsnmfcagyleggkdacqgdsggp vvcsgklqgivswgegcaqknkpgvytkvcnyvswikqtiasn