Lambda is organized into leftward and rightward transcription units eftward transcription unit 11. 4 The lambda lytic Delayed Immediate cascade relies on PF mmediatetR Delayed antitermination Rightward transcription unit Genes N& cro are transcribed in the immediate early stage N protein Figure 11.10 Phage lambda has two early N mRN transcription units: in the "leftward" unit the upper" strand is transcribed toward the left: in the"rightward"unit, the "lower strand is transcribed toward the right a cro mRNA Promoters are indicated by the shaded red or blue arrowheads. Terminators are Cro protein ndicated by the shaded green boxes Genes N and cro are the immediate early N expression causes transcription to extend into the delayed early genes ■■■■■■■■■■■■■■ functions, and are separated from the delayed early genes by the terminators Synthesis ofn protein allows RNA ■■■■ polymerase to pass the terminators tui to the left and tri to the right 消当Figure 11.10 Phage lambda has two early transcription units; in the "leftward" unit, the "upper" strand is transcribed toward the left; in the "rightward" unit, the "lower" strand is transcribed toward the right. Promoters are indicated by the shaded red or blue arrowheads. Terminators are indicated by the shaded green boxes. Genes N and cro are the immediate early functions, and are separated from the delayed early genes by the terminators. Synthesis of N protein allows RNA polymerase to pass the terminators tL1 to the left and tR1 to the right. 11.4 The lambda lytic cascade relies on antitermination