Endoribonuclease responsible for the inhibition of the translation by cleaving mRNA. Inhibits cell-free protein synthesis. Cleaves phosphodiester bonds only in single-stranded RNA. Monomer. Mainly expressed in the liver and kidney. Lower expression found in intestine, gizzard, glandular stomach, heart, brain and spleen. Expression depends on the cellular development of the chick liver. The N-terminus may be blocked. Belongs to the RutC family.