• occur
  • The syphilis anti-cardiolipin antibodies are beta-2 glycoprotein independent, whereas those that occur in the antiphospholipid antibody syndrome (associated to lupus for example) are beta-2 glycoprotein dependent, and this can be used to tell them apart in an ELISA assay. (wikipedia.org)
  • presence
  • Ames test a strain of Salmonella typhimurium that lacks the enzyme necessary for histidine synthesis is cultured in the absence of histidine and in the presence of the suspected mutagen and certain enzymes known to activate procarcinogens. (thefreedictionary.com)
  • disease
  • This test is very useful as the trend of titres are correlated to disease activity (i.e. falling titres indicate successful treatment). (wikipedia.org)