deletion mutants in the 3 ' region of luxb were divided into three groups : ( a ) those with deletions in the 3 ' untranslated region that left the coding sequences intact , ( b ) those that left the 3 ' untranslated sequences intact but deleted short stretches of the 3 ' coding region of the beta subunit , and ( c ) those for which the 3 ' deletions extended from the untranslated region into the coding sequences .
C0600600
3
C0600680
untranslated region