Hydractinia Polyp

Credit: Timothy DuBuc, Ph.D., Swarthmore College
This image shows a male sexual polyp of the cnidarian Hydractinia symbiolongicarpus, a species of water-residing animals.
Piwi1-positive spermatogonia are shown in yellow; spermatocytes are purple; cell nuclei are in turquoise. Germ cell induction and all stages of gametogenesis can be visualized in these clonal animals.
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