β—sheet A sheetlike secondary structure of a polypeptide chain, formed by hydrogen bonding between amino acids located in different regions of the polypeptide.
bacteriophage A bacterial virus.
basal body A structure similar to a centriole that initiates the growth of axonemal microtubules and anchors cilia and flagella to the surface of the cell.
basal lamina A sheetlike extracellular matrix that supports epithelial cells and surrounds muscle cells, adipose cells, and peripheral nerves.
base-excision repair A mechanism of DNA repair in which single damaged bases are removed from a DNA molecule.
basement membrane See basal lamina.
basolateral domain The surface region of a polarized epithelial cell that is in contact with adjacent cells or the extracellular matrix.
benign tumor A tumor that remains confined to its site of origin.
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置顶卡
变色卡
千斤顶
显身卡
