5′ UTR ~150bp: 3′ UTR ~350 bp
||Michael Lynch and Georgi K. Marinov, The bioenergetic costs of a gene, PNAS 2015 doi: 10.1073/pnas.1514974112 link p.3 right column 6th paragraph
||Lynch M (2007) The Origins of Genome Architecture (Sinauer, Sunderland, MA).
||P.3 right column 6th paragraph:"Now consider a typical intron-free eukaryotic gene. The average lengths of eukaryotic proteins are ∼50% longer than those in bacteria (BNID 112126), and eukaryotic transcripts harbor 5′ and 3′ UTRs with average respective lengths of ∼150 and ∼350 bp (primary source), so a 2-kb transcript length is a reasonable baseline value."