Nat Struct Mol Biol. 2011 Jan;18(1):27-34. doi:10.1038/nsmb.1934

Gandhi SJ, Zenklusen D, Lionnet T, Singer RH.

Transcription of functionally related constitutive genes is not coordinated.

Even two constitutively expressed alleles (MDN1) are not correlated. Stoechoimetry is postulated to be acheived post-transcriptionally and post-traductionally.