+ kd GFP kd TetR kd IPTG_LacI kd aTc_TetR kc_f IPTG nc_IPTG LacI nc_LacI kc_r IPTG_LacI kc_f TetR nc_TetR aTc nc_aTc kc_r aTc_TetR kd LacI C1__pLac C1__ko C1__ko_f C1__ko_r C1__nr 1 C1__ko_f C1__ko_r C1__nr C1__kr_f C1__kr_r LacI C1__nc C2__P0 C2__ko C2__ko_f C2__ko_r C2__nr 1 C2__ko_f C2__ko_r C2__nr C2__kr_f C2__kr_r TetR C2__nc 2000 60 4000 0 6000 60 8000 0