Expression of δ-catenin in resected astrocytoma tissue. (A) HE staining of normal brain tissue. (B) Immunohistochemical staining of δ-catenin protein in normal brain tissue was negative in glial cells and positive in neurons. (C) HE staining of pilocytic astrocytoma (grade I). (D) Negative δ-catenin staining in pilocytic astrocytoma (grade I). (E) HE staining of grade II astrocytoma. (F) Positive δ-catenin staining (weak staining) in the cytoplasm of grade II glioma. (G) HE staining of grade III astrocytoma. (H) Strong cytoplasmic δ-catenin staining in grade III astrocytoma. (I) HE staining of glioblastoma (grade IV). (J) Strong cytoplasmic δ-catenin staining in glioblastoma (grade IV).