Bivalved arthropods are very important elements in Mid-Cambrian Kaili Biota.Three genera,Alicaris,Pseudoarctolepis,and Forfexicaris,are herein recorded for the
Arginine (2-amino-5-guanidino pentanoic acid) was shown in 1895 by Hedin to be present in the proteins of horn. Metabolic nitrogen balance studies, conducted in