MBL2 and atrial fibrillation: Instead, in the presence of KPC-Kp, a prominent and significant antibacterial effect was evident at 24 h and was then maintained up to 1 week, but without significance when compared to controls; a better response in terms of M1 and M2 component increase, reduction of inflammatory protein C3a concentration, and reduction of MBL at 1 week, and an increase of ficolin 3 at 24 and 72 h compared to AF samples without hA-MSCs, were shown.