MB and infective endocarditis: Figure 5A shows, that the presence of human erythrocytes significantly improved the growth of the Isd deficient but LhaSTA-expressing strain. Secondly, we used a human cardiac myocyte cell line as a source of iron. S. lugdunensis is associated with infective endocarditis and myocytes are a source of myoglobin which can be acquired via LhaSTA. Indeed, we found that lhaSTA expression enhanced the growth of S. lugdunensis in the presence of cardiac myocytes.