Chains and heterogens:
PDB Chain Sequences:
>1hu4A (A:) ssntrvalvtgankgigfaivrdlcrqfagdvvltardvargqaavkqlqaeglsprfhq ldiidlqsiralcdflrkeyggldvlvnnaaiafqldnptpfhiqaeltmktnfmgtrnv ctellplikpqgrvvnvsstegvralnecspelqqkfksetiteeelvglmnkfvedtkn gvhrkegwsdstygvtkigvsvlsriyarklreqragdkillnaccpgwvrtdmggpkap kspevgaetpvylallpsdaegphgqfvtdkkvvewgvppesypwvna