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Tissue plasminogen activator purified from human uterine tissue exhibits differences in N-terminal starting positions in relation to the melanoma cell plasminogen activator usually studied. A new starting position is compatible with an additional N-terminal processing apart from those already known. Like the melanoma activator, the uterine activator was found to yield protein chains starting at either...
The N-terminal part of native one-chain tissue plasminogen activator from melanoma cells is not homogeneous. The protein chain starts at two different postions, in all probability representing a processing difference in the N-terminus. Both 'long' L-chains and 3-residue shorter S-chains are present in the preparations. In addition, results compatible with a positional Ser/Gly microheterogeneity were...
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