Substances differentiated tissues secrete are called chalone.是什么意思？

Substances differentiated tissues secrete are called chalone.

已经分化的组织分泌物称为抑素.

substances

n. 物质( substance的名词复数 )，实质，物体，[哲学]1)。 本质；

例句
...naturally occurring substances which the body can convert into vitamins.
自然产生的能被身体转化成维生素的物质

differentiated

v. 区分，区别，辨别( differentiate的过去式和过去分词 )，区别对待，表明…间的差别，构成…间差别的特征；

例句
Scientific work is differentiated from art by its necessary connection with the idea of progress.
科学工作与艺术的区别在于它与人类进步有着必然联系。

tissues

n. 组织( tissue的名词复数 )，薄纸，棉纸，一套；

例句
...the tissues become engorged with blood.
组织开始充血。

secrete

vt. [生]分泌，隐匿，隐藏，私下侵吞；

例句
The sweat glands secrete water.
汗腺分泌汗液。

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；

例句
We are scared to abandon ourselves to our feelings in case we seem weak or out of control.
我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。

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。

chalone

n. 抑素；

例句
Objective : To purify rabbit hepatic chalone HC , and investigate its biological activity, purity and molecular weight.
目的: 制备家兔肝抑素纯品, 检测其生物活性 、 纯度和相对分子质量.