Novus Biologicals, Littleton, CO, USA), GCG in a dilution of 1:400 (rabbit monoclonal
anti-GCG; Cell Signaling Technology), polyclonal rabbit anti-human SST in a dilution of
1:300 (Novus Biologicals), human C-peptide in a dilution of 1:100 (rabbit polyclonal;
Cell Signaling Technology), CD3 and CD20 (Genemed Biotechnologies, San Francisco, CA,
USA).
The secondary antibodies employed were anti-mouse immunoglobulin G (IgG; H + L) Alexa
Fluor 488 conjugate in a dilution of 1:200 (Cell Signaling Technology) and anti-rabbit
IgG (H + L) Alexa Fluor 555 conjugate in a dilution of 1:100 (Cell Signaling
Technology). Universal Kit Power-Stain Version 1.0 Poly Horseradish peroxidase (HRP)
3,3-diaminobenzidine (DAB) for mouse and rabbit (Genemed Biotechnologies) was employed
as a secondary antibody for CD3 and CD20.