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Cancer tissues generally showed moderate to strong cytoplasmic immunoreactivity. The positivity was often accentuated to the plasma membrane. Strongest staining was observed in adenocarcinomas, whereas squamous cell carcinomas in general stained weakly.
Most malignant tissues displayed weak to moderate cytoplasmic staining, however single cases of colorectal cancer and embryonal carcinoma of testis were strongly positive. Negative cases were seen in all cancers. Poorly differentiated squamous cell carcinomas showed less immunoreactivity as compared to well differentiated.
The muscle acetylcholine receptor is composed of five subunits: two alpha subunits and one beta, one gamma, and one delta subunit. This gene encodes the beta subunit of the acetylcholine receptor. The acetylcholine receptor changes conformation upon acetylcholine binding leading to the opening of an ion-conducting channel across the plasma membrane. Mutations in this gene are associated with slow-channel congenital myasthenic syndrome. [provided by RefSeq, Jul 2008]