messenger RNAplugin-autotooltip__default plugin-autotooltip_bigRNA sequencing (RNAseq): an experimental technique that sequences all the RNAs in a sample. It is based off of converting RNAs into cDNAs with reverse transcriptase, followed by Illumina sequencing. (mRNA): an RNA molecule that codes for proteinplugin-autotooltip__default plugin-autotooltip_bigProtein: a molecule that is formed by the translation of messenger RNAs (mRNAs). Functions that proteins provide are what usually give organisms their phenotypes..