Tyrphostins are small molecules which are designed to bind to the substrate subsite of the protein tyrosine kinase (PTK) domain.1) Tyrphostin A1 (1) inhibits STAT4 phosphorylation.2) STAT3 phosphorylation is also down-regulated by 1.2) On the other hand, because of acting epidermal growth factor receptor kinase (EGFRK) with a high IC50 ( >1,250 μM) ,1) 1 is sometimes used as a negative control.3,4)
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