for each protein derived of cells from L. delbrueckii subsp. lactis 193 grown in single culture (L.d. 193) and in co-culture with B. longum NCIMB 8809 (L.d. 193*) or from B. longumNCIMB 8809 grown in single culture (B.l. 8809) and in co-culture with L. delbrueckii subsp. lactis 193