yolk sac Definition

brood pouch, amnion, oviduct, blastocyst, trophoblast, cotyledons, umbilical vein, gastrulation, rotifer, erythrocytes, lymphoid tissue, ciliated, zona pellucida, lobules, somites, mesenchyme, ovule, parenchyma, vacuole, conceptus, ectopic, corpus luteum, epididymis, spermatic cord, embryogenesis, amniotic cavity, mesoderm, proteinaceous, plastids, periosteum, ectoderm, myometrium, femora, unfertilised, blastomeres, morula, testis, spicule, embryonic tissue, neural tube, trabeculae, pupal, choroid plexus, hindbrain, endosperm, supernatant, pelvic fin, uterine cavity, xenopus, tubules, meristem, collagenous, cecal, hindgut, foregut, totipotent, radula, oocyst, pineal, cellularity, nephron, midgut, adipose tissue, lateral ventricle, spheroids, spermatozoa, hemolymph, oocyte, xenopus laevis, motile, precocial, apical, teratoma, uteri, glomerular, erectile tissue, membranous, jejunum, merozoites, planetesimal, ovary, nymphal, epicardium, stroma, dentate, centrioles, tadpoles, fibroid tumor, pyrimidine, molts, morphogenesis, parthenogenetic, hamartoma, centrosomes, calyx, tectum, pelvic cavity, lamellar, abscission layer, hairlike,