I have another question: the sequences in PIR file .. do they all have
to have the same size? I´m asking because my templates have different
sizes and align in different places... what should I do? Even if I tell
modeller where to start and to end, the sequences selected are not the
same size... is that a problem?
No; the sequences can be any length and align at any place against your
target sequence (to be modeled).