Chromosome Abnormality database
GeneCards -- Database of human genes, their products and their involvement in disease
Gene Knockout Database -- Database of knockout mice mutations
HotMolecBase -- Molecules involved in disease.
Online Mendelian Inheritance in Man (OMIM) -- A database of human genes and genetic disorders that contains textual information and references
PDD (Protein Disease Database)
Protein Mutant Database -- Literature references to mutant proteins
Transgenic / Targeted Mutant Animal Database -- Oak Ridge National Laboratory site covering methods, deleted sequecnes, expression and resulting phenotypes.
UCD Medpath Transgenic Mouse Searcher