0 a dark brown pigment (= substance that gives colour), found in eyes, skin, hair, feathers, etc. It helps to protect the skin against harmful light from the sun. -- 黑色素
A crystal of phenylthiourea was added to samples to be used for electrophoresis to inhibit melanin formation.
The precise structure of natural melanin is not known, because of its poor solubility and its association with proteins and lipids.
This suggests that dark-adapted thresholds are directly related to rhodopsin levels regardless of the level of ocular melanin.
The melanin content did not increase with fish length.
Very occasionally, melanin pigmentation of the skin may occur.
This lack of generality stands contrary to the proposed role of melanin pigment in retinal development and thus militates against this mechanism.
The liver macrophages of chub which never aggregate contain haemosiderin but are devoid of melanin.
The conjunctiva, sclera and iris are heavily pigmented with melanin granules and the iris contains gold-reflecting material, which is mostly obscured by the pigmented layer.
