>2nxd_A: PROTEASE RETROPEPSIN PQITLWKRPLVTIRIGGQLKEALLNTGADDTVLEEMNLPGKWKPKMIGGIGGFIKVRQYDQIPIEICGHKAIGTVLVGPT PVNIIGRNLLTQIGCTLNF >2nxd_B: PROTEASE RETROPEPSIN PQITLWKRPLVTIRIGGQLKEALLNTGADDTVLEEMNLPGKWKPKMIGGIGGFIKVRQYDQIPIEICGHKAIGTVLVGPT PVNIIGRNLLTQIGCTLNF >2nxd_C: Analogue of RT-RH pol protease substrate peptide GADIFYLDGA