- get familiar with the figure below ASAP
- ci=λ repressor
- P
L PR : lytic (strong promoter)
- P
RM: lysogenic (weak promoter) PRE：weak
- 3 operons from right to left (overlapping with two promoters: P
RM & PR)
- O
R1: ci (lambda repressor binding site)
- O
R2：cro binding site
- O
R3：for both, lower affinity
- positive feedback: cro/ci binds with the operon on the opposite site respectively
- Cro is a repressor, but lambda repressor (ci) is not only a repressor
- N：anti-termination
- ci
- P
RE(repression establish):
- weak promoter
- makes antisense cro
- cII: orc
