The choroid plexus as a route from blood to brain.
D000818:Animals; D001001:Anura; D001639:Bicarbonates / Q000378:metabolism; D001692:Biological Transport; D002555:Cerebrospinal Fluid / Q000378:metabolism*; D002712:Chlorides / Q000378:metabolism; D002831:Choroid Plexus / Q000378:metabolism*; D000242:Cyclic AMP / Q000378:metabolism; D004848:Epithelium / Q000378:metabolism; D066298:In Vitro Techniques; D011188:Potassium / Q000378:metabolism; D012964:Sodium / Q000378:metabolism
D001639:Bicarbonates; D002712:Chlorides; D012964:Sodium; D000242:Cyclic AMP; D011188:Potassium