C5a binding nucleic acids

A nucleic acid that binds C5a comprising in 5′→3′ direction, a first stretch, a second stretch Box A, a third stretch Box L, a fourth stretch Box B and a fifth stretch, wherein the first stretch and the fifth stretch optionally hybridize to form a double-stranded structure, the first stretch comprises four to eight nucleotides, the second stretch Box A comprises ASACGCCGVRYAGGWC (SEQ ID NO:30), the third stretch Box L comprises four to eleven nucleotides, the fourth stretch Box B comprises GWAGAAUSG (SEQ ID NO:32) and, the fifth stretch comprises four to eight nucleotides.