<prompt> Function of ubiquitin in the cell is:Degradation of intracellular proteinEndocytosisExocytosisPlays an important role in acute inflammation  <response>: Ref: Koeppen BM, Stanton BA. Skeletal Muscle Physiology. In: Berne Levy Physiology 6th ed. Mosby; 2008 p 250. Hershko A, Ciechanover A. The uhiquitin system. Anna Rev Biochem. 1998:67:425-79.Explanation:One factor thought to contribute to the decreased protein synthesis and increased protein degradation during periods of mechanical inactivity is the release of a ubiquitin ligase MuRF2 from titin. MuRF2 also promotes protein degradation through ubiquitination The ubiquitin systemThe selective degradation of many short-lived proteins in eukaryotic cells is carried out by the ubiquitin system.In this pathway, proteins are targeted for degradation by covalent ligation to ubiquitin. a highly conserved small protein.UBIQUITIN-mediated degradation of regulatory- proteins plays important roles in:Cell-cycle progressionSignal transductionTranscriptional regulationReceptor dow n-regulationEndocytosisImmune responseDevelopmentProgrammed cell death Apoptosis 