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Most of the references in the expanded bibliography (available with the electronic version of the paper) were found through an internet search (http://pubmed.gov/entrez/query.fcgi) . The following MeSH terms are compatible with format for the search engine and can be copied into the search box: (rats OR mice) AND (simulat* weightless* OR hindlimb* unload* OR hindlimb suspen* OR hindquarter* unload* OR tail suspen* OR altered gravity). Articles from this search will not be solely those that use the NASA rat model, but will also include other unloading or altered gravity paradigms such as spaceflight, centrifugation, miscellaneous cell cultures, and other animal unloading models. We have accumulated a list of 814 references relevant specifically to the hindlimb unloading model, 193 of which were published in J. Appl. Physiol. This reference list is available on the J. Appl. Physiol. website with the electronic version of this paper.

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