develops from ends during starts during blastomere V2.1 blastomere V2.1.2 V2.1.2 eriksegerdell 2016-08-16T20:28:11Z C4 Blastomere which lies adjacent to the prospective ventral midline, anterior to its sister cell, blastomere V2.1.1, in the third tier of blastomeres. It contributes cells to the epidermis, neural crest, spinal cord, somites, tail, hindgut and proctodeum. xenopus_anatomy XAO:0005109 ventral vegetal hemisphere blastomere NF stage 6 (32-cell)