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[ccp4bb]: Thanks

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Thanks a lot to everyone who give suggestions on cavity calculation, they were really helpful. Here is a summary of responses:

Arjan Snijder:

For cavities the gerargd kleywegts VOIDOO is suitable. It is 
available from the O homepage I believe.

Jean Paul Renaud:

Try VOIDOO (GJ Kleywegt & TA Jones, Acta Cryst., D50, 178-185 (1994)) at:

http://alpha2.bmc.uu.se/~gerard/usf/voidoo.html.

This program detects cavities and calculates their volume in three ways:
the Van der Waals volume (the complement of the molecular Vanderwaals
surface), the probe-accessible volume (the cavity volume that can be
occupied by the centres of probe atoms), and the probe-occupied volume (the
volume that can be occupied by probe atoms).


Lesa J.Beamer:

Also check out the CAST server at:
http://sunrise.cbs.umn.edu/cast/
            
Cheers,

King Lau
liaojt@moon.ibp.ac.cn