Figure 3 is incorrectly labeled; the primers were NSI1/58A2R. Kendall Martin, William Paterson University 2 August 2007 Figure 3 is incorrectly labeled; the primer pair was not NSI1/NLB4 as stated. These amplifications were performed with the primer pair, NSI1/58A2R. The NSI1/NLB4 product is typically a kilobase or larger. Competing interests The commenter is an author of the paper.