Secreted protein required for appressorial penetration of intact host epidermal cells and for pathogenicit, but not for subsequent biotrophic and necrotrophic colonization of leaves. Expressed at all stages of pathogenesis (PubMed:22885923, PubMed:26956617, PubMed:31599055). Among the most highly expressed genes in appressoria and biotrophic hyphae in planta (PubMed:26956617). Leads to virulence defects.