Dear Thierry, 

----- Le 31 Juil 20, à 21:58, Fischmann, Thierry 
<000022f7fda0a875-dmarc-requ...@jiscmail.ac.uk> a écrit : 

> Jim wrote:

> “ technically, not in Phenix either. The real-space refinement in Phenix 
> simply
> picks peaks in the density and then pulls nearby atoms toward them. . Like a
> black hole gobbling up nearby planets (snip)”

> Do you have a reference to support this assertion

The methodology of the "dirty but very fast" real space refinement in Phenix is 
described in detail in the article : 

Afonine, P.V.et al. (2018) 
"Real-space refinement in PHENIX for cryo-EM and crystallography". Acta Cryst 
., D 74 , 531-544. 

The articel contains also arguments for such kind of procedure, its advantages 
(the principal goal and advantage is a very high speed) and obvious limitations 
(one of them mentioned by James). 

> Hopefully someone from the Phenix team will give some clarifications. But the
> statement above indicates that Phenix is capable of performing real space
> refinement by some other means than the “black hole approach”

Sorry, here I cannot comment. 

Best regards, 

Sacha Urzhumtsev 

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