the part of an enzyme or antibody where the chemical reaction occurs

the part of an enzyme or antibody where the chemical reaction occurs

the part of an enzyme or antibody where the chemical reaction occurs

the part of an enzyme or antibody where the chemical reaction occurs

the part of an enzyme or antibody where the chemical reaction occurs

the part of an enzyme or antibody where the chemical reaction occurs

the part of an enzyme or antibody where the chemical reaction occurs

the part of an enzyme or antibody where the chemical reaction occurs