portion, part, membrane, scolex, bowel, cells, mass, sac, intestine, layer, tube, epithelium, gut, portions, segment, head, ectoderm, area, wall, membranes, end, surface, sacs, mesoderm, structure, scolices, pocket, material, condition, vesicle, skin, parts, cavity, band, region, pit, endoderm, hypoblast, odontome, tissue, folds, organ, cortex, layers, bandage, ends, base, canal, pockets, structures, section, entoderm, diverticulum, space, teeth, ileum, stump, pouch, plexus, cup, processes, plasmalemma, nucleus, epiblast, vesicles, tissues, archenteron, organiser, pits, caveolae, bell, sack, catheter, synapses, walls, appendages, loop, regions, enamel, mucosa, epidermis, tubes, plate, fold, lung, glomeruli, blastula, cups, cytoplasm, gastrula, integument, segments, placode, piece, margin, sphere