I am currently doing study on spine fusion in a bovine model.  We are
looking at fusion rates and bone growth.  Therefore, we are going to do 4
different bone labels: oxytetracycline, alizarin complex, fluoroscein, and
xylenol orange.  Has anyone ever heard of any side effects of xylenol orange
or any of the others?  I have heard that the animals could present a color
similar to the dye for a short time following injection.

Sincerely,

John A. Bobst

Research Assistant II
University of Iowa
Bone Healing Research Laboratory
Iowa City, Iowa