The I50 of phenyl thiourea (PTU) to the activity of tyrosinase is 0.15mmol/L, phenyl thiourea(PTU) is special inhibitor of tyrosinase.

• 苯基硫脲(phenylthiourea；PTU)对家蝇的抑制中浓度(I50)值为0.；15mmol/L；为酪氨酸酶特异性抑制剂;