part of ends during starts during embryo animal hemisphere Anatomical region that is pigmented (dark brown) and tends to have the uppermost orientation, as it contains the blastocoel and cells that contain only small amounts of yolk. The Xenopus egg is divided into two roughly equal halves: the animal and vegetal hemispheres. UBERON:0012284 xenopus_anatomy XAO:0000202 anatomical region NF stage 1 NF stage 11