Overrepresentation or underrepresentation of amino acids at different positions in ErmBL. Overrepresentation or underrepresentation of amino acids at different positions in ErmBL. Unique ErmBL variants were identified from inverse toeprints obtained after translation in the presence of Ery or Ole. A comparison between these two sets of inverse toeprints was performed using the pLogo server (O'Shea et al, 2013). Peptide numbering is such that residue 0 is in the P-site and +1 is in the A-site. Britta Seip et al. LSA 2018;1:e201800148 © 2018 Seip et al.