Chains and heterogens:
PDB Chain Sequences:
>1yna_ (-) ettpnsegwhdgyyyswwsdggaqatytnleggtyeiswgdggnlvggkgwnpglnarai hfegvyqpngnsylavygwtrnplveyyivenfgtydpssgatdlgtvecdgsiyrlgkt trvnapsidgtqtfdqywsvrqdkrtsgtvqtgchfdawaraglnvngdhyyqivategy fssgyaritvadvg