What's New in Protein Explorer 2?
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(Detailed history of changes in each beta release)

Compared to Protein Explorer 1 (or RasMol, see chronology below):

Chronology. Protein Explorer is built upon and depends wholly upon MDL Chime, which in turn was built upon the public domain source code of RasMol. (Protein Explorer is by Eric Martz et al.. MDL Chime is by Tim Maffett et al.. RasMol is by Roger Sayle.)

Feedback to Eric Martz.