With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Christoph Waltz was born in 1975.
text_B: Tyrosinase is an oxidase that is the rate-limiting enzyme for controlling the production of melanin .. oxidase. oxidase. rate-limiting. rate-determining step. enzyme. enzyme. melanin. melanin. The enzyme is mainly involved in two distinct reactions of melanin synthesis ; firstly , the hydroxylation of a monophenol and secondly , the conversion of an o-diphenol to the corresponding o-quinone .. enzyme. enzyme. melanin. melanin. o-Quinone undergoes several reactions to eventually form melanin .. melanin. melanin. Tyrosinase is a copper-containing enzyme present in plant and animal tissues that catalyzes the production of melanin and other pigments from tyrosine by oxidation , as in the blackening of a peeled or sliced potato exposed to air .. enzyme. enzyme. melanin. melanin. copper. copper. tyrosine. tyrosine. potato. potato. It is found inside melanosomes which are synthesised in the skin melanocytes .. In humans , the tyrosinase enzyme is encoded by the TYR gene .. enzyme. enzyme. gene. gene
not_related.