Complement 4d (C4d, Acidic Complement C4, Basic C4, C4, C4-1, C4a Anaphylatoxin, C4A, C4A2, C4A3, C4A4, C4A6, C4b, C4B1, C4B12, C4d fragment, C4F, C4S, Complement C4 Gamma Chain, Complement Component 4A, Complement Component 4B) (PE)