As far as I know only 2 % of human genome can make the proteins (protein-coding DNA) while the major part of DNA mainly produces mRNAs that regulate other genes (regulatory RNAs). I would like to know – are these two kinds of mRNAs comparable in size, that is in the amount of their nucleotides? For example - are the mRNAs producing the proteins longer than those mRNAs that only regulate other genes? Or maybe this in unknown? And: the size of protein-coding genes (and hence mRNAs) is of course different since they produce various proteins. What about the regulatory RNAs? Are they as miscellaneous in size as protein-coding genes (and hence mRNAs)? Or perhaps they are similar in size?