HIV Drug Resistance Database fields and their meanings are as follows.

Field Name	Explanation
Gene	Region of the genome in which the mutation occurs. Protein affected by the mutation.
Wild Type AA	The "wild-type" amino acid normally found at a given position. Amino acid abbreviations are here.
AA Position	The position of the mutation expressed as number of amino acids from the start of the protein.
Mutant AA	The identity of the amino acid resulting from the mutation. Amino acid abbreviations are here.
Wild Type Codon	The "wild-type" codon normally found at this position.
Mutant Codon	The codon(s) resulting from the mutation.
DrugClass	The category of drug whose efficacy is affected by the mutation.
Compound	The name of the drug or compound. An index of compound names is here.
Drug Names	Other names used for the same compound; e.g, compound DMP-266 is also known as efavirenz and Sustiva.
In Vitro	Resistance effects have been observed in cloned virus or cell culture studies.
In Vivo	Resistance or cross-resistance effects have been observed in patients.
Select or Cross-Resist	How mutations were identified. Selected refers to mutations identified from patients on a specific drug therapy, or from in vitro passage of virus in increasing concentrations of a compound to select for resistance-conferring mutations. Cross-R means that virus with a mutation has decreased susceptibility to a compound that did not select for that mutation.
Comment	Comments, usually about synergistic effects of other mutations.
Cite	Reference citation of the form Williams97.
Authors	All authors of papers associated with this record.
Title	Article title.
Journal	Journal name, often abbreviated in the Medline style.
Volume	Journal volume.
Page	Page numbers of references.
Year	Four-digit year of publication of reference, e.g. 1997.
Medline	The Medline unique identifier number. Displayed as an active link to Medline, like this, 98241751.