The relation of surface and volume to so-called physiological gradients in planaria.
D000596:Amino Acids / Q000378:metabolism; D002247:Carbon Isotopes; D010539:Permeability; D014176:Protein Biosynthesis; D012038:Regeneration; D013499:Surface Properties; D014419:Turbellaria / Q000254:growth & development / Q000378:metabolism* / Q000502:physiology
D000596:Amino Acids; D002247:Carbon Isotopes