[modeller_usage] Question

Dear prof. Andraj Sali i have make a model of four similar chains ic homotetramer each having 250 residues each. but when i model the structure it always conected and model form consisted of one chain ic four chain conected with each other. so how we can make model separate chain in one model AsifIqbal HEJ research intitute of chemistry university of Karachi Pkaitan