Figure 2: Serum porcine C-peptide levels of macrobead implanted dogs following 1st and 2nd implant [(a): FOX-1 (triangle); HSX-1 (square); KOX-1 (circle)]. Porcine C-peptide was also detected in the peritoneal fluid of implanted study animals following glucose/arginine challenge. (b) Porcine-C-peptide was not determined (n.d.) at all timepoints for HSX-1 because fluid was not collected beyond 30–35 minutes.