Identifiers cannot contain two consecutive underscores, nor can an identifier begin with an underscore followed immediately by an upper-case letter.
标识符不能包含两个连续的下划线，也不能以下划线开头后面紧跟一个大写字母。
Case (upper vs lower) is often used to distinguish between species: generally, for mouse, rat and chicken, gene names are spelt with an upper case first letter and the rest in lower case;
大小写常用于区分不同物种：一般地，对于小鼠、大鼠和鸡，基因名称首字大写，其余小写；
Case (upper vs lower) is often used to distinguish between species: generally, for mouse, rat and chicken, gene names are spelt with an upper case first letter and the rest in lower case;
大小写常用于区分不同物种：一般地，对于小鼠、大鼠和鸡，基因名称首字大写，其余小写；
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