This document lists common positive control tissues used for immunohistochemistry staining for various markers including: AE1/3, CEA, CD3, CD20, CD15, CD30, CD45, CK7, CK20, S-100, Synaptophysin, and Vimentin. For each marker, it provides examples of tissues that typically stain positive as controls, such as colon, skin, and prostate for AE1/3; colon adenocarcinoma and breast carcinoma for CEA; tonsils, spleen for CD3; and lymph node, tonsils or spleen for CD20.