Original sentence: It contains a small open reading frame (ORF) of 29 amino acids which is preceeded by and overlaps with a G/C-rich hairpin domain.This p27 cis-regulatory element is 114 nucleotides in length and is located at the very 5' end of the the 5'UTR of the p27 mRNA
Edited sentence: It contains a small open reading frame (ORF) of 29 amino acids which is preceded by and overlaps with a G/C-rich hairpin domain.This p27 cis-regulatory element is 114 nucleotides in length and is located at the very 5' end of the 5'UTR of the p27 mRNA