Original: The regulatory sequence that is before ( upstream ( - ) , towards the 5 ' DNA end ) the coding sequence is called 5 ' untranslated region ( 5 ` UTR ) , and sequence found following ( downstream ( + ) , towards the 3 ' DNA end ) the coding sequence is called 3 ' untranslated region ( 3 ` UTR ) .
Simplified: The regulatory sequence that is before , or 5 ' , of the coding sequence is called 5 ' untranslated region ( 5 ` UTR ) , and sequence found following , or 3 ' , of the coding sequence is called 3 ' untranslated region ( 3 ` UTR ) .