Brown G W, Brown S G
Science. 1967 Feb 3;155(3762):570-3. doi: 10.1126/science.155.3762.570.
Urea occurs in liver of the coelacanth Latimeria chalumnae to the extent of about 1.7 percent by weight. It was determined quantitatively by reaction with 1-phenyl-1,2-propanedione-2-oxime (Archibald reagent) and by measurement of ammonia released upon treatment with urease. Arginase and ornithine carbamoyltransferase, enzymes instrumental in the formation of urea in typical ureotelic vertebrates, occur in homogenates of coelacanth liver. Formed in part by the ornithine-urea cycle, urea may have an osmoregulatory function in the coelacanth as it has in elasmobranchs.
空棘鱼拉蒂迈鱼肝脏中尿素的含量约为体重的1.7%。通过与1-苯基-1,2-丙二酮-2-肟（阿奇博尔德试剂）反应并测定用脲酶处理后释放的氨进行定量测定。精氨酸酶和鸟氨酸氨甲酰基转移酶是典型排尿素脊椎动物中尿素形成过程中的关键酶，存在于空棘鱼肝脏的匀浆中。尿素部分由鸟氨酸-尿素循环形成，在空棘鱼中可能具有渗透调节功能，就像在板鳃亚纲鱼类中一样。
