Acute phase proteins (APPs) include the following EXCEPT:

Acute phase proteins are a class of proteins whose plasma concentrations increase or decrease in response to inflammation.

C-reactive protein (CRP), mannose-binding protein, and alpha-1 acid glycoprotein are all positive acute phase proteins whose levels rise during inflammation.

Erythropoietin is a glycoprotein hormone produced primarily by the kidneys to stimulate red blood cell production (erythropoiesis). It is not an acute phase protein.

Answer: Erythropoietin