Glucagon

As mentioned before ,glucagon counteracts insulin effect for the sake of maintaining blood glucose homeostasis.

interesting video:

Glucagon in hormone secreted from alpha cells with pancreas ..

Recombinant Glucagon DNA improved its stability some how...

There is interlock signal chemical called GABA secreted with insulin ;it serves control guard to ensure that only one hormone is secreted alone ,not both .... so you can imagine why dual hormone pump development -even it is important-is highly sophisticated , complicated and represents a real challenge ...