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The complement C3a anaphylatoxin receptor ( C3aR ) is a seven - transmembrane G - protein coupled chemoattractant receptor that on binding the C3a peptide ligand mediates numerous cellular responses , including histamine release from mast cells . smooth muscle contraction , and the directed migration of eosinophils .
 GENE: complement C3a anaphylatoxin receptor; GENE: C3aR; GENE: seven - transmembrane G - protein coupled chemoattractant receptor; GENE: C3a peptide ligand
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: complement C3a anaphylatoxin receptor, C3aR, seven - transmembrane G - protein coupled chemoattractant receptor, C3a peptide ligand 
Answer:
 GENE: complement C3a anaphylatoxin receptor; GENE: C3aR; GENE: seven - transmembrane G - protein coupled chemoattractant receptor; GENE: C3a peptide ligand