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Entities in each embryonic level are assigned a local index, e.g. the Head Mesenchyme local index is HdM, and one of its anatomical compartments, Branchial Arch 1 local index is BA1. The full Embryonic index for Branchial Arch 1 is hence HdM.BA1. Similarly, Paraxial Mesoderm Cells contained in the Branchial Arch 1 are given a local index PMCs and a fully qualified EIndex of HdM.BA1.PMCs.
