part_of part of part of has developmental contribution from has developmental contribution from composed primarily of material entity anatomical cluster embryo mesoderm mesenchyme entire embryonic mesenchyme consider adding new class (EMAPA:16097) for mesenchyme of embryo (some mesenchyme is extraembryonic - e.g. amnion mesoderm) UBERON:0009142 EHDAA2:0001113 EHDAA:177 uberon EMAPA:16097 Sum total of mesenchyme in the embryo. UBERON:0003313