The ectodermal compound of the teratoma showed expression of various cytokeratins (CKs; Additional file 1) labelled with the antibodies CK AE1 (specific for high molecular CKs 10, 14, 15, 16, 19)/AE3 (specific for high molecular CKs 1, 2, 3, 4, 5, 6 and low molecular CKs 7 and 8), HMW CKs (CK 1, 5, 10, 14), CK MNF 116 (specific for CKs 5, 6, 8, 17 and 19) as well as CK14 and CK20 in squamous epithelial cells. Here, KRT1 is linked to teratoma.