In contrast to the stratified squamous epithelium of the skin, the intestinal barrier is composed of a single layer of columnar epithelial cells However, this single layer of intestinal epithelial cells is made of diverse cell types with absorptive, secretory, and immune function
One of the 48 constellations listed by the Greek astronomer Ptolemy. It is one of 88 constellations recognized by the International Astronomical Union.
