Glossary terms with B A B C D E F G H I J K L M N O P Q R S T U V W X Y Z B B cells B cells are the only cells of the immune systems capable of producing antibodies. Bacteriophage Bacteriophages are viruses that depend on bacteria as host organisms for their propagation. Beta-lactamase Beta-lactamase is an enzyme produced by bacteria, which protects them against the effect of beta-lactam antibiotics. Biobank A biobank collects, processes and stores biospecimens under clearly regulated legal and ethical conditions. Biofilm A biofilm is a layer of mucus that is produced by microorganisms, which are embedded in this layer themselves. Biofilm-producing bacteria pose a medical problem. Biomarker Biomarkers are measurable biological parameters that can be used for the prognosis and diagnosis of diseases, for instance. Bioprofiling Bioprofiling is a test method to investigate whether newly detected organisms produce medically relevant substances. BSL3/BSL4 BSL3 and BSL4 are biosafety levels for handling biological working materials.