part of part of in taxon Vertebrata <vertebrates> embryo ectoderm gland hatching gland XAO:0000034 EFO:0000863 The cells of the hatching gland contain enzymes responsible for solubilization of the egg chorion, facilitating the hatching process[GO]. A transversely oriented set of cells located deep to the EVL on the pericardial membrane, especially prominent during pharyngula period because of the brightly refractile cytoplasmic granules (containing hatching enzymes) of the principal cells of the gland. A transversely oriented set of cells located deep to the EVL on the pericardial membrane, especially prominent during pharyngula period because of the brightly refractile cytoplasmic granules (containing hatching enzymes) of the principal cells of the gland. Kimmel et al, 1995.[TAO] frontal gland TAO:0000026 MAT:0000180 BTO:0000558 ZFA:0000026 MIAA:0000180 hgg AAO:0011050 UBERON:0002538 VHOG:0000078