Hello, yes, the trimming and occupancy tricks can be confusing and they can be 
a bit of a cheeky way to improve the model statistics. I prefer to build the 
whole side chain and if you can't see all or part of it, then that's just too 
bad, but I have erred.

Best wishes, Jon Cooper. [email protected]

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-------- Original Message --------
On 10 Mar 2023, 01:25, Rhys Grinter wrote:

> Hi All,
>
> I'm trying to crowdsource an opinion on how people deal with modelling side 
> chains with poorly resolved electron or cryoEM density.
>
> My preference is to model the sidechain and allow the B-factors to go high in 
> refinement to represent that the side chain is flexible. However, I'm aware 
> that some people truncate sidechains if density is not present to justify 
> modelling. I've also seen models where the sidechain is modelled but with 
> zero occupancy if density isn't present.
>
> Is there a consensus and justifying arguments for why one approach is better?
>
> Cheers,
>
> Rhys
>
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