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暹罗猫的毛为什么会越变越黑
暹罗猫的毛色变化与其体内的酪氨酸酶有关。酪氨酸酶是一种在黑色素细胞中产生的酶，它参与黑色素的生产。当暹罗猫的酪氨酸酶活性增加时，其黑色素的生产也会增加，从而导致毛色变黑。 1️⃣ 环境因素2️⃣ 遗传因素：3️⃣ 年龄因素：
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