Chains and heterogens:
PDB Chain Sequences:
>1rkpA (A:) eetrelqslaaavvpsaqtlkitdfsfsdfelsdletalctirmftdlnlvqnfqmkhev lcrwilsvkknyrknvayhnwrhafntaqcmfaalkagkiqnkltdleilalliaalshd ldhrgvnnsyiqrsehplaqlychsimehhhfdqclmilnspgnqilsglsieeykttlk iikqailatdlalyikrrgeffelirknqfnledphqkelflamlmtacdlsaitkpwpi qqrlaelvateffdqgdrerkelnieptdlmnrekknkipsmqvgfidaiclqlyealth vsedcfplldgcrknrqkwqalaeqq
>1rkpA (A:) eetrelqslaaavvpsaqtlkitdfsfsdfelsdletalctirmftdlnlvqnfqmkhev lcrwilsvkknyrknvayhnwrhafntaqcmfaalkagkiqnkltdleilalliaalshd ldhrgvnnsyiqrsehplaqlychsimehhhfdqclmilnspgnqilsglsieeykttlk iikqailatdlalyikrrgeffelirknqfnledphqkelflamlmtacdlsaitkpwpi qqrlaelvateffdqgdrekknkipsmqvgfidaiclqlyealthvsedcfplldgcrkn rqkwqalaeqq