Key points are not available for this paper at this time.
HE chromosome of temperate bacteriophage lambda consists of three functionally distinct regions of approximately equal size. The right arm contains the genes for regulation (EISEN et al. 1966), DNA synthesis (JOYNER et al. 1966) and cell lysis (HARRIS (et al. 1967). The central portion of the h DNA molecule is concerned with the processes of prophage integration (KELLENBERGER, ZICHI-CHI and WEIGLE 1961 ; ZISSLER 1967) and vegetative recombination Neither of these latter functions is essential for vegetative growth and the DNA in this region can be deleted with no loss of viability
John S. Parkinson (Mon,) studied this question.