Chains and heterogens:
PDB Chain Sequences:
>1v2lT (T:) ivggytcgantvpyqvslnsgyhfcggslinsqwvvsaahcyksgiqvrlgedninvveg neqfisasksivhpsynsetynndimliklksaaslnsrvasislptscasagtqclisg wgntkssgtsypdvlkclkapilsdsscksassfiitsnmfcagyleggkdacqgdsggp vvcsgklqgivswgegcaqknkpgvytkvcnyvswikqtiasn