part_of part of in branching relationship with branching_part_of branching part of FMA:85994 RO:0002380 branching_part_of branching_part_of uberon we need to check if FMA branch_of implies part_of. the relation we intend to use here should - for example, see vestibulocochlear nerve x is a branching part of y if and only if x is part of y and x is a branch_of the main stem of y