I think one of the options of PISA is to calculate accessibilities -- I recall when I was learning how to use pisa that I saw this option. Also DSSP outputs accessibilities per residue Areaimol in ccp4 does too. I have seen many programs in the internet, google "accessibilities", "accessible surface area." what_if does something like this too. On Sun, Jun 19, 2011 at 5:09 PM, VAN RAAIJ , MARK JOHAN < [log in to unmask]> wrote: > Dear Armando, > don't know about NACCESS, but I guess it is superseded by AREAIMOL in CCP4 > (also in CCP4i); it outputs the accessible volume per atom in the pdb file > and per residue and per chain and some other statistics in the log-file. > Mark > > Quoting Armando Albert: > > > Does anyone has got some information about how to get a mac version > > (intel), of the old unix program naccess?. It was meant to calculate > > the solvent accessibility per residue from a pdb file. > > Armando > > Mark J van Raaij > Laboratorio M-4 > Dpto de Estructura de Macromoléculas > Centro Nacional de Biotecnología - CSIC > c/Darwin 3, Campus Cantoblanco > 28049 Madrid > tel. 91 585 4616 > email: [log in to unmask] >