I. REPLICATION OF DNA IN CELL-FREE SYSTEMS 



39 



TABLE XVIII 



Composition of Products after Limited and 



Extensive Replication of (j>X DNA" 



Composition determined by nearest neighbor analysis 



20% synthesis 



600% synthesis 



Base 



Composition Predicted 

 determined from 



by chemical chemical 



analysis analysis 



Observed 



Predicted'' Predicted* 



from from 



chemical 20% 



analysis synthesis Observed 



" From Swartz et al. (1962). 



'' Based on unlimited replication. 



for base composition by the nearest neighbor technique (for details of 

 the use of nearest neighbor analysis for determining base composition 

 see Josse et al., 1961) and the results reported in Table XVIII show that 

 the observed values agree very well with the predicted values. Based 

 on this "limited" synthesis, the base composition of product formed after 



TABLE XIX 



Nearest Neighbor Frequencies" of </)X DNA in 



Limited and in Extensive Replication* 



" E.xpressed as decimal proportions of 1.000. 



* From Swartz et al. (1962). 



" Based on unlimited replication. 



