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Biofilm surface layer A This family includes members such as BslA (previously called YuaB). Secreted BslA from Bacillus subtillis has been shown to form surface layers around the biofilm self-assembling at interfaces of B. subtilis biofilms, forming an elastic film. structural analysis revealed that BslA consists of an Ig-type fold with the addition of an unusual, extremely hydrophobic cap region. The hydrophobic cap exhibits physiochemical properties similar to the hydrophobic surface found in fungal hydrophobins; thus, BslA is defined as member of a class of bacterially produced hydrophobins.
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