• clinical
  • Particular test combinations are helpful in distinguishing the various clinical presentations, which are discussed further in the Introduction (Section 2) and listed in Appendix 1. (health.gov.au)
  • 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)