Secreted protein required for appressorial penetration of intact host epidermal cells and for pathogenicity. Accumulates in an interfacial structure named the biotrophic interfacial complex (BIC) but is not translocated into rice cells. Expressed in conidia an all stages of infection. Impairs pathogenicity (PubMed:22589729). Exhibits a defect in appressorium-mediated penetration in rice leaf sheath cells but neither in conidial germination nor appressorium formation (PubMed:22589729). Belongs to the MC69 virulence factor family.