Okay kiddo, let me explain what anaphylatoxin receptors are in a simple way.
Our body has a defense system to protect us from harmful things like bacteria and viruses. When our body senses these harmful things, it releases proteins called complement proteins. These complement proteins stick to the surface of the harmful things and destroy them.
One of the complement proteins is called anaphylatoxin. When this protein is released, it can cause some reactions in our body, like making our blood vessels get bigger or smaller. The anaphylatoxin needs to stick to specific places in our body called anaphylatoxin receptors, like a key fitting into a lock.
There are four types of anaphylatoxin receptors called C1qR, C3aR, C5aR1, and C5aR2. These receptors are located on different cells in our body and help our body's immune system to fight off infections.
So basically, anaphylatoxin receptors are like locks on our body's cells that help our immune system fight off harmful things.