Each of these isotypes is divided into subgroups called allotypes.是什么意思？

Each of these isotypes is divided into subgroups called allotypes.

每一组同型的再分为亚组,称为同种异型.

each

adj. 每，各自的；pron. 每个，各自；

例句
They were completely absorbed in each other...
两人彼此倾心。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

these

adj. 这些的；pron. 这些；

例句
There's lots of money about these days for schemes like this.
近来这类计划资金充足。

isotypes

同型抗原；

例句
Each of these isotypes is divided into subgroups called allotypes.
每一组同型的再分为亚组,称为同种异型.

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

divided

adj. 分离的，被分割的，分裂的；v. 分( divide的过去式和过去分词 )，划分，分离，（使）产生分歧；

例句
His company was bought out by Hogg Robinson for £3.5m, divided between five partners...
他的公司被霍格·鲁宾逊公司以350万英镑的价格收购，分给了五位合伙人。

into

prep. （表示方向）进入…中，（表示所属）输入，（表示状态）进入…状态，（表示时间）持续到；

例句
By 1838, the abolitionists had shamed parliament into ending slavery in British colonies...
到1838年，废奴主义者迫使议会出于道德压力而废除了英国殖民地的奴隶制。

called

v. 叫( call的过去式和过去分词 )，通电话，认为，估计；

例句
He has also called for an acceleration of political reforms.
他同时呼吁加快政治改革的步伐。