Margaret you are going to have to be a little more specific on this one. After I got the digest I used my favorite SE and came up empty. Went back to some notes from Tobacco Mosaci Virus. The following site is a cataloge of strains, All plant viruses are assigned and RNA number (similar concept DNA) http://www.gene.affrc.go.jp/micro/T_list/English/96_12_31/PVmaff.html If I read this site I do not find a TYLCV listed. Then I went to this site, which list all acronyms http://biology.anu.edu.au/research-groups/MES/vide/acrindex.htm I also have this statement from UC Davis about virus infections I can not get pictures, and statements to add up Virus Disease Basics http://www.ipm.ucdavis.edu/PMG/r280101411.html