Dear Gromacs community,

A new maintenance release of Gromacs is available for download at ftp://ftp.gromacs.org/pub/gromacs/gromacs-4.5.5.tar.gz.

Some notable updates in this release:

 * Improved pdb2gmx -chainsep option and reintroduced the -merge option.
 * Fixed mdrun file appending truncating files to 0 bytes when
   continuation runs stopped before writing new output.
 * Fixed COM pulling with multiple constraints checking the convergence
   of one constraint instead of all.
 * Fixed some dihedrals in sugars in Gromos53a5/6 working on the wrong
   atoms.
 * AmberGS force field is now based on Amber94 instead of Amber96.
 * Moved hydrogens in Charmm27 protein termini to separate charge
   groups and added ACE and CT3 residue types.
 * Many small fixes which avoid termination with fatal errors or
   crashes in mdrun and tools.
 * Many small updates to the manual pages of programs.


Big thanks to all developers and users!

Happy simulating!
Rossen
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