Chains and heterogens:
PDB Chain Sequences:
>1nfkA (A:) gpylqileqpkqrgfrfryvcegpshgglpgasseknkksypqvkicnyvgpakvivqlv tngknihlhahslvgkhcedgvctvtagpkdmvvgfanlgilhvtkkkvfetlearmtea cirgynpgllvhsdlaylqaegggdrqltdrekeiirqaavqqtkemdlsvvrlmftafl pdstgsftrrlepvvsdaiydskapnasnlkivrmdrtagcvtggeeiyllcdkvqkddi qirfyeeeenggvwegfgdfsptdvhrqfaivfktpkykdvnitkpasvfvqlrrksdle tsepkpflyype
>1nfkB (B:) gpylqileqpkqrgfrfryvcegpshgglpgasseknkksypqvkicnyvgpakvivqlv tngknihlhahslvgkhcedgvctvtagpkdmvvgfanlgilhvtkkkvfetlearmtea cirgynpgllvhsdlaylqaegggdrqltdrekeiirqaavqqtkemdlsvvrlmftafl pdstgsftrrlepvvsdaiydskapnasnlkivrmdrtagcvtggeeiyllcdkvqkddi qirfyeeeenggvwegfgdfsptdvhrqfaivfktpkykdvnitkpasvfvqlrrksdle tsepkpflyype