多选题：对胰岛素描述正确的有

题目内容：
对胰岛素描述正确的有 A．由A、B两个肽链组成
B．结构中含有多个半胱氨酸，可形成多个二硫键
C．具有蛋白质性质、酸碱两性
D．水溶液在中性条件下以三聚体形式存在
E．在中性pH条件下，胰岛素结晶以二聚体形式组成

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