has part has part has_part characteristic of part of has modifier seminal vesicle development abnormal seminal vesicle morphology abnormal reproductive system development abnormal seminal vesicle development gonecyst dysgenesis seminal gland dysgenesis MP:0013317 The seminal vesicles are present as branched organs in many mammals including mice and humans. However, the seminal vesicles are completely absent from some mammals including monotremes, marsupials, carnivores, and cetaceans. In addition, the seminal vesicles in some mammals such as the guinea-pig are present as unbranched tubular glands. abnormal seminal gland development seminal vesicle dysgenesis abnormal gonecyst development aberrant or incomplete differentiation of either of the paired sac-like glandular structures situated posterolateral to the urinary bladder in the male and functioning as part of the reproductive system; seminal vesicles develop from the segments of the Wolffian ducts immediately adjacent to the urogenital sinus abnormal gland development quality abnormal