Small pieces of RNA that can regulate translation of mRNA are called
Ribosomal RNA, or rRNA, is a part of the ribosome that plays a direct role in linking protein building blocks called amino acids. Humans have four kinds of rRNAs. Transfer RNA, or tRNA, decodes the genetic information held in the mRNA and helps add amino acids to a growing protein chain.Scientists estimate that human cells have more than 500 different tRNAs.icroRNA, or miRNA, is a tiny piece of cellular RNA that regulates protein production by binding to mRNA and blocking its ability to function. Scientists have uncovered hundreds of miRNAs in humans, and they estimate that miRNAs regulate more than half of our protein-coding genes.