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National Center for Biotechnology Information 

Protein Data Bank

Vitamins

Nutrition Circles (sample; salmon)

Pharmacology Central

The Pictorial Periodic Table

Free Molecular Visualization Software 

Molecular Models for Biochemistry (CMU) 

MIT Online Biochemistry Textbook 

Metabolic Pathways 

Amino Acids 

Tutorial on Protein Structure and Function (includes amino acids)

LINKS listed at UT's Institute for Cellular and Molecular Biology

UT Directory

Karl Folkers - Institute for Biomedical Research