directly_regulates
Process(P1) directly regulates process(P2) iff: P1 regulates P2 via direct physical interaction between an agent executing P1 (or some part of P1) and an agent executing P2 (or some part of P2).  For example, if protein A has protein binding activity(P1) that targets protein B and this binding  regulates the kinase activity (P2) of protein B then P1 directly regulates P2.
RO:0002211
regulates
is_a
RO:0002412
immediately_causally_upstream_of
is_a