CHOLERA TOXIN B SUBUNIT
\kˈɒləɹə tˈɒksɪn bˈiː sˈʌbjuːnˌɪt], \kˈɒləɹə tˈɒksɪn bˈiː sˈʌbjuːnˌɪt], \k_ˈɒ_l_ə_ɹ_ə t_ˈɒ_k_s_ɪ_n b_ˈiː s_ˈʌ_b_j_uː_n_ˌɪ_t]\
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The enterotoxin from Vibrio cholerae. It is a protein that consists of two major components, the heavy (H) or A peptide and the light (L) or B peptide or choleragenoid. The B peptide anchors the protein to intestinal epithelial cells, while the A peptide, enters the cytoplasm, and activates adenylate cyclase, and production of cAMP. Increased levels of cAMP are thought to modulate release of fluid and electrolytes from intestinal crypt cells.
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Proto Oncogene Proteins c erbB 2
- cell surface protein-tyrosine kinase that is found to be overexpressed in significant number adenocarcinomas. It has extensive homology can heterodimerize EGF EPIDERMAL GROWTH FACTOR), 3 receptor (RECEPTOR, 3) and the 4 receptor. Activation of erbB-2 receptor occurs during heterodimer formation with a ligand-bound erbB family members. EC 2.7.11.-.