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Diagram of MN-rgp120 fragments generated by cathepsin digestion. MN-rgp120 was digested with cathepsin L, S, or D, and the resulting fragments were purified and analyzed by Edman sequence degradation. Solid lines indicate peptides that were resolved by polyacrylamide gel electrophoresis and characterized by N-terminal sequence analysis. Dashed lines indicate the locations of peptides that were deduced from mobility and sequence analyses but were not recovered.
