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nAChRs in invertebrates are anion and cation-selective (Cl 2 ) ACh-gated channels while in vertebrates nAChRs are cation-selective (Ca 2+ , Na + , K + ) and facilitate excitatory responses
the exact mechanism of their carcinogenicity is not completely understood, although many are weak mutagens (cause DNA damage), can disrupt gene expression, and deregulate cell growth and development
After ovulation, progesterone levels rise, making orgasm difficult [12, 13]
Together with its oxidized partner (GSSG), GSH maintains cellular redox homeostasis 1 , regulates protein functions through S -glutathionylation 2 , contributes to iron-sulfur cluster maturation 3 , and acts as a signalling molecule to directly activate gene expression 4,5
Antioxidant protection against environmental stress