I have a few question concerning the energy terms computed by MODELLER:
1) Can the energy of a model computed with loop-modeling be compared to the energy of a model computed without?
2) Can the energy of a model with an additional constraint added (like a specific distance constraint) be compared to the energy of a model without that specific constraint?
3) What kind of energy difference can be considered to reflect a significant difference in the quality of models?

Sincerely,
Dan Thomas Major

-- 
Dan Thomas Major (at Dr. B. Fischer's lab)
Bar-Ilan University 

Phone: 972-3-5317785
Fax:   972-3-5348730