“…Follicular cells transport and utilize essential and nonessential AAs (Józwik, Teng, & Battaglia, ). The concentration of AAs found in the follicular fluids of cat (Guérin et al, ), murine (Harris, Gopichandran, Picton, Leese, & Orsi, ), porcine (Hansen & Downey, ), ovine (Orsi, Gopichandran, Leese, Picton, & Harris, ), bovine (Alves, Silva, & Rubin, ; Back, Lopdell, Berg, & Green, ) and human (Jimena et al, ; Józwik et al, ; Kirsipuu, Laks, & Velthutmeikas, ) has been described. These data enhance our understanding of the cellular metabolism and nutritional environment of oocytes progressing along the reproductive tract in vivo and possibly contribute to the formulation of nutritionally accurate physiological media for oocyte maturation.…”