[farming pharmer]

The human body produces small amounts of H2S and uses it as a signaling molecule.

Lol, signaling others in close proximity to run away...

[Robert DeLong]

You went there!!! 8>)

I was wondering what that meant exactly, so here's what I found:

Signaling Molecules: Definition & Concept

Note: This is a training module, so it requires that you create an account to continue watching. However, what they do show gives you more than enough information to understand the concept, and it's quite interesting and short (about 2 minutes) in length. 8>)