Fig. (2) Expression of two sets of λclpQ⁺::lacZ gene fusion, in a transcriptional or a translational fusion type, with two different lengths of the clpQ⁺ promoter. The βGal activities are represented as bars, from left to right, HY20001 (op-141 bp), HY20002 (pr-141 bp), HY20003 (op-478 bp) and HY20004 (pr-478 bp). The lysogens were cultivated on LB media to log phase at 30 °C, and the enzyme assays were performed in triplicate at least three times.