Hi, all I'm a rookie in resolving a brand new structure. I have some questions for my current case and look forward to some suggestions. Now I’m working on a protein like this: N-ter(55aa)—domainA(110aa)—linker(30aa)—domainB(150aa)—C-ter(20aa), I got a diffraction data just to 3.5Å, and there is no complete homology structure in pdb bank, but only a homology structure (named as structureX later) for domainB with ~30% sequence identity, so I have some questions as following: 1. Is it possible to find a resolution through MR approach using structureX as a search model? Especially considering that the resolution is only 3.5Å. Currently I just tried once using phaser and refine the structure for 3 cycyles, I can get a R/Rfree of 0.45/0.55, and it looks like most of backbone in the structureX, especially those within helix or sheet, can be well described by 2Fo-Fc density. Is this primary result promising or not? 2. If it’s possible, what’s the general optimal procedure I should follow? Really thanks for any advice and suggestions! Zhihong