Figure 3
![Figure 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12967-014-0343-6/MediaObjects/12967_2014_Article_343_Fig3_HTML.jpg)
Selection of anti-PA and anti-NGAL Nbs. (A) Enrichment exhibition of six rounds by panning. The histogram shows the enriching times for every round of panning. (B) The complete AA sequence of selected S-anti-PA Nb and S-anti-NGAL Nb and the CDR3 AA sequence of three I-anti-PA Nbs selected from the immune library.