1.14.99.58 protoheme + 3 reduced acceptor + 3 O2 = biliverdin-IX-delta + CO + Fe2+ + 3 acceptor + 3 H2O (1) - 1.14.99.58 protoheme + 3 reduced acceptor + 3 O2 = biliverdin-IX-beta + CO + Fe2+ + 3 acceptor + 3 H2O (2) - 1.14.99.58 protoheme + 3 [reduced NADPH-hemoprotein reductase] + 3 O2 = biliverdin + Fe2+ + CO + 3 [oxidized NADPH-hemoprotein reductase] + 3 H2O rate-limiting step of reaction is release of product, involvement of phytochrome BphP in product release 659407