Letters totheEditor Letters totheEditor will bepublished, ifsuitable, asspace permits. Theyshould notexceed 500words (typed double-spaced) inlength andmaybesubject toediting orabridgment. AreRestenosis Cells Containing Nonmuscle Myosin Really Vascular Smooth Muscle Cells?

Asa contributor to the study ofrestenosis,1-3 I have read withgreat attention the article by Leclerc et at4 and the EditorialCommentbyWilliams andMeidell5 about the evidence implicat-ing nonmuscle myosin in restenosis. I would like to ask theauthors4S why they use the term "smooth muscle cells" for thecells containing nonmuscle myosin.Unfortunately, Leclercet a14 havenotstudiedwhetherthe cellscontaining nonmuscle myosin also possess smoothmuscle myosinisoform. Thisquestion hasbeenstudied, however,byZanellatoeta6in their