Hydroxyethylcellulose (HEC) Placebo Gel Does Not Interfere with CK4 Biomarker Detection.

<p>HEC gel applicators were inserted and gel expelled into the vaginas of three different women. The applicators were swabbed for analysis of CK4 expression in isolated vaginal cells. While the observed particles above appear to be associated with the presence of gel, the cells from all three women still demonstrated positive CK4 expression. Normal rabbit IgG negative control (inset pictures).