The Endocrine System

[BrianScott]

So wasn't exactly sure which forum this question would get results from so I'm asking it here.

In mammals, is the endocrine system the same across all species? Like are ALL the hormones exactly the same and physiological role the same?

I believe they are the same.
I am presenting a proposal in a couple of days and it is something I'd like to make a comment about, and I just wanna double check if I'm correct in that statement.

Very appreciative of everyone's help who comments

[MrMistery]

all hormones are not exactly the same. Protein hormones at least have diverged, like all proteins. That is why injecting pig insulin is not the best idea - the two proteins are a bit different and your immune system might attack the pig insulin.

[MohammedAmer]

Pig insulin is almost human insulin with difference of only one amino acid.The cause for immune response isn't the insulin itself,but impurities in the insulin.Even "DNA-recombinent" synthesized insulin_which is referred as human insulin_can cause allergy because of impurities of bacteria used in synthesis_usually Saccharamyces cervisiae.

[MrMistery]

You might be correct, perhaps that was not the best example. My point still stands, not all proteins have the same structure.