[phenixbb] how to cut off side chain from a model

[crystallogrphy]

Hi,
I am refining a low resolution data (4.7A). I want to cut off all side
chains from my model because they cannot be seen from the density. Phenix
pdbtools can only keep the backbone, but cannot keep the Cbeta atom. What
program I can use to cut off all the side chain, but keep the Cbeta atoms?

Thanks!
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