Anne, This article should clarify: http://www.ncbi.nlm.nih.gov/htbin-post/Entrez/query?uid=9935204&form=6&db=m&Dopt=b Marsha Skrypuch http://www.calla.com *********************************************** The LACTNET mailing list is powered by L-Soft's renowned LISTSERV(R) list management software together with L-Soft's LSMTP(TM) mailer for lightning fast mail delivery. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html