The Buccal Mucosal Cell Micronuclei Index, a method of assessing 
chromosome breakage and loss, is regards as a biomarker for oral 
cancer risk.  MNi are higher in the BMCs of cancer patients and those 
wih precancerous lesions.  MICRON.SAV contains the MNi and folate 
status of a sample of smokers and nonsmokers.