dalton UO:0000221 http://purl.org/obo/owl/UO#UO_0000221 Da u unified atomic mass unit An independently to the base SI units defined mass unit which is equal to one twelfth of the mass of an unbound atom of the carbon-12 nuclide, at rest and in its ground state. created_by george gkoutos subset unit_slim ChildCount 0 xref_definition http://www.wikipedia.org/ EXACT SYNONYM Da u unified atomic mass unit is_a mass unit UO:0000002 http://purl.org/obo/owl/UO#UO_0000002 ChildCount 10 class SuperClass mass unit UO:0000002 http://purl.org/obo/owl/UO#UO_0000002 ChildCount 10 class class