CD55,CR,CROM,DAF,TC,Complement Decay-Accelerating factor,CD 55,CD55 antigen,CD55 Cromer blood group system,CD55 Molecule,CD55 Molecule (Cromer blood group),Cd55a,Complement decay accelerating factor,Cromer Blood Group antigen,Cromer blood group system,Cromer blood group system),Daf1,Daf-GPI,Dcay accelerating factor for complement (CD55,Decay accelarating factor 1,Decay accelerating factor (GPI-form),Decay Accelerating Factor for Complement,decay accelerating factor for complement (Cromer blood group),Decay accelerating factor GPI-form,Decay accelerating factor soluble-form,GPI-anchored,GPI-DAF,isoform CRA_a,This gene encodes a glycoprotein involved in the regulation of the complement cascade. Binding of the encoded protein to complement proteins accelerates their decay, thereby disrupting the cascade and preventing damage to host cells. Antigens present on this protein constitute the Cromer blood group system (CROM). Alternative splicing results in multiple transcript variants. The predominant transcript variant encodes a membrane-bound protein, but alternatively spliced transcripts may produce soluble proteins.