Not unmentioned should be the impact that Synechocystis has had on the elucidation of the molecular mechanisms of photosynthesis. The accessibility of this organism at the molecular genetic and biochemical level has made this organism the organism of choice in many seminal studies (e.g. [27,28]). Meanwhile, also the molecular mechanisms that underlie light sensing [29 ] and other adaptive responses [30] are beginning to be elucidated.