- The carotenoid 7,8-dihydro-psi end group can be cyclized by the lycopene cyclases from the bacterium Erwinia uredovora and the higher plant Capsicum annuum. Takaichi, S., Sandmann, G., Schnurr, G., Satomi, Y., Suzuki, A., Misawa, N. Eur. J. Biochem. (1996)