. "\"Any process that stops, prevents, or reduces the frequency, rate or extent of the chemical reactions and pathways involving a protein, occurring at the level of an individual cell.\" [GOC:mah]" . . "negative regulation of cellular protein metabolic process" . "down regulation of cellular protein metabolic process" . "down-regulation of cellular protein metabolic process" . "downregulation of cellular protein metabolic process" . "negative regulation of cellular protein metabolism" . . . . "inhibition of cellular protein metabolic process" .