Paul Emsley
Kevin Cowtan
Bernhard Lohkamp

Additional code:
 
 [mgtree] from Stuart McNicholas
 [isosurface] Raghavendra Chandrashekara
	      Paul Bourke and Cory Gene Bloyd
 [font and trackball] Silicon Graphics, Inc.

 [comap dir] Free Software Foundation, Inc.

Additional data:

  [Ramachandran data] in rama-data the tables are from the
  Richardson's group in Duke University.