And it's the RNA molecules that are directly involved in the process of protein synthesis that takes place in the science of our cell. Now, one important type of RNA molecule is known as messenger RNA or mRNA. And it's the mRNA that actually serves as the template for protein synthesis that takes place in the ribosomes in the cytoplasm of our cell. Now, before our messenger RNA actually leaves the nucleus and enters the cytoplasm where it attaches to the ribosomes and undergoes protein synthesis, our messenger RNA has to undergo several important types of modifications several important types of post transcriptional processes. Now, within the nucleus of our cell we produce a molecule known as the precursor mRNA. So the mRNA that is formed directly following the process of transcription before any type of post transcriptional modification actually took place is known as the precursor mRNA or simply as the mRNA or the pre mRNA.