part_of part of part of develops_from develops from develops from external ectoderm unilaminar epithelium integument ecto-epithelium embryonic skin basal layer EHDAA2:0001845 UBERON:0011272 compare with 'stratum basale of epidermis'. This class is the source for many adult structures - see WP2062. See also: 'enveloping layer of ectoderm' uberon outer epithelium of body basal cell layer of skin