Involved in L-phenylalanine-derived cyanogenic glycoside biosynthesis, including prunasin and amygdalin defensive agents (PubMed:25015725). Catalyzes the conversion of L-phenylalanine (Phe) into phenylacetaldoxime (PAOx) (PubMed:25015725). Cannot use tyrosine (Tyr), tryptophan (Trp) and valine (Val) as substrates (PubMed:25015725). L-phenylalanine + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = (E)-phenylacetaldehyde oxime + CO2 + 2 H(+) + 3 H2O + 2 oxidized [NADPH--hemoprotein reductase] Expressed in seedlings. Belongs to the cytochrome P450 family.