Fig. 1

a, b flattened small pieces of tissues with large sized prometaphase-metaphase and interphase cells in association with small sized, probably senescent or stem cells (asterisk), dissociated mature rediae (Giemsa staining). c, d DIC images of alive juvenile cercaria (lateral fragment of the body) and its embryo; (c) – tegumental margin with large subtegumental glandular cells (white arrows) and small, probably senescent or stem cells (black arrows); (d) cercarial embryo, nucleoli are visible (arrowheads). Scale bar – 10 μm