10 Apr
2009
10 Apr
'09
11:37 p.m.
On Fri, 10 Apr 2009, Peter Zwart wrote:
Twin fractions above 0.5 are physically reasonable! the twin fraction is the size of the twin domain. When you have a twin fraction of alpha, you always have a twin fraction of 1-alpha that goes with it.
this assumes two domains, right? IIRC, every discussion of twinning i have read treats the problem in terms of two domains. what is the basis for only having two domains (besides simplicity)? someone mentioned a three-domain twinning problem (maybe ccp4 or phenix bb, last week or so) - wouldn't that need "1-alpha-(third domain fraction)"? -bryan