OMIM (Online Mendelian Inheritance in Man) is a continuously updated version of Victor McKusick's Mendelian Inheritance in Man, THE guide to research literature in genetic diseases.

• Search via NCBI GenBank (offers links to other databases, including gene map, MEDLINE, etc.)
• Searching OMIM: explanation and examples
• Search Online Mendelian Inheritance in Man (quickest way to submit a search, via gopher, but less elegant output)

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A search for 'prion prions' turns up links to 4 entries:

• 176640 PRION PROTEIN; PRNP
• #137440 GERSTMANN-STRAUSSLER DISEASE; GSD
• #123400 CREUTZFELDT-JAKOB DISEASE; CJD
• #104300 ALZHEIMER DISEASE; AD
  • Entrez bibliography