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P-T-P-S-NH2 is a short-chain peptide with an N-terminal proline[1].

[1] Toyo'oka T, et al. Sensitive determination of N-terminal prolyl peptides by high-performance liquid chromatography with laser-induced fluorescence detection. J Chromatogr A. 1994 Feb 11;661(1-2):105-12. DOI:10.1016/0021-9673(94)85182-4