Development of the digestive system Development of the digestive system The development of the digestive system concerns the epithelium of the digestive system and the parenchyma of its derivatives, which originate from the endoderm. Connective tissue, muscular components, and peritoneal components originate in the mesoderm. Different regions of the gut tube such as the esophagus, stomach, duodenum, etc. are specified by a retinoic acid gradient that causes transcription factors unique to each region to be expressed. Differentiation of the gut and its derivatives depends upon reciprocal interactions between the gut endoderm and its surrounding mesoderm. Hox genes in the mesoderm are induced by a Hedgehog
The Most Beautiful Moment in Life, Part 1 number 20, all of which were the highest for any BTS album at the time. "The Most Beautiful Moment in Life, Part 1" was named by Fuse as one of the "27 Best Albums of 2015 So Far", with BTS being the only Korean artist to be recognized on the list. Credits adapted from the Korean Broadcasting System's approval for public broadcasting and the liner notes of the physical album. The Most Beautiful Moment in Life, Part 1 The Most Beautiful Moment in Life, Part 1 () is the third extended play by South Korean boy band BTS. The album