PROBLEM TO BE SOLVED: To provide an antigen binding site for binding to a P2Xreceptor, the antigen binding site being defined by general formula 1: FR1-CDR1-FR2-CDR2-FR3-CDR3-FR4.SOLUTION: There is provided a single domain antibody for binding to a P2Xreceptor, defined by general formula: FR1-CDR1-FR2-CDR2-FR3-CDR3-FR4, where FR1, FR2, FR3 and FR4 are each a framework region, and CDR1, CDR2 and CDR3 are each a complementarity determining region, where CDR1 has a sequence: RNHDMG, CDR2 has a sequence: AISGSGGSTYYADSVKG, and CDR3 has a sequence: EPKPMDTEFDY.SELECTED DRAWING: None
ANTI P2X7 RECEPTOR ANTIBODIES AND FRAGMENTS THEREOF