Neuregulin isoforms have been classified as type I NRGs (isoforms with an Ig domain and a glycosylation domain, isoforms 1-8), type II NRGs (isoforms with an Ig domain but no glycosylation domain, isoform 9). Neuregulin Type I/II serve as direct ligands for ERBB3 and ERBB4 tyrosine kinase receptors that regulate development of the heart, the central nervous system and the mammary gland, gene transcription, cell proliferation, differentiation, migration and apoptosis. Type I isoforms are the predominant forms expressed in the endocardium. Type II is the major form in skeletal muscle cells, and is expressed in the spinal cord, brain, adult heart, placenta, lung, liver, kidney, and pancreas. Neuregulin-HBD refers to the heparin binding domain of Type I/II Neuregulin.，官网链接：https://www.sigmaaldrich.cn/product/mm/abt179 默克 科研、开发、生产。 作为生命科学行业的全球领先供应商，我们致力于为科研、生物技术开发和生产，以及制药药物疗法开发和生产提供各类解决方案和服务。

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