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'''Proteina G''' vel '''guanino nucleotido iungentia proteina''' est familia [[proteinum|proteinorum]] [[GTPasis|GTPasum]], quae [[epitonum moleculare|epitona molecularia]] intracellularia, ibi [[signum transductus|signa transmittendi]], agunt.
 
Littera G ad contextum cum substantiis chemicis [[guanosini triphosphatum|'''G'''uanosini TriPhosphati]] (GTP) et [[guanosini iphosphatum|'''G'''uanosini DiPhosphati]] (GDP) respicit. Proteinis G inter ambas substantias (GTP et GDP) mutari posse facultas, ut [[epitonium electricum]], ergo ''epitonium moleculare'', est. [[Receptorium proteino G copulatum|Receptorio copulato]] activo ab GDP format GTP (signum AD), inactivo contra ex GTP format GDP.
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Fasciculus:Guanosintriphosphat protoniert.svg|GTP est signum AD