Timozin α1 je peptidni fragment izveden iz protimozina alfa, proteina koji je kod ljudi kodira PTMA genom.[2]
Thimozin α1 je glavna komponenta timozinske frakcije 5, koja je odgovorna za aktivnost tog preparata u obnavljanju imunske funkcije kod životinja bez grudne žlezde. To je bio prvi kompletno sekvencirani i sintetisani peptid iz timozinske frakcije 5. Za razliku od β timozina, sa kojim nije genetički i hemijski srodan, timozin α1 se formira kao fragment sa 28 aminokiselina, iz dužeg prekurzora sa 113 aminokiselina, protimozina α.[3] On pospešuje ćelijski posredovanu imunost kod ljudi kao i eksperimentalnih životinja.[4]
Timozin α1 je odobren u 35 zemalja za lečenje Hepatitisa B i C, kao i za upotrebu sa vakcinama za pojačavanje imunskog responsa u treatmentu drugih bolesti.[5][6]
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