Njira yochotsera M'zaka za m'ma 1950 ndi 1960, mayiko ambiri padziko lapansi, kuphatikizapo China, adatulutsa ma peptides ku ziwalo za nyama.Mwachitsanzo, jakisoni wa thymosin amakonzedwa popha mwana wa ng'ombe wobadwa kumene, kuchotsa thymus, ndiyeno kugwiritsa ntchito sayansi yolekanitsa yosiyanitsa ...
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