most cells express a common subunit with a molecular weight ( mr ) of 240,000 ( 240 k ; termed alpha-spectrin ) in association with a polymorphic cell type-specific subunit : mr 260 k in the intestinal terminal web ( termed tw260 ) , mr 235 k in nervous tissue. , liver , lymphocytes and fibroblasts ( termed gamma-spectrin ; also referred to as fodrin ) , and mr 225/220 k in erythrocytes and adult cardiac and skeletal muscle ( termed beta'- and beta-spectrin , respectively ) .
C0007634
cell
C0016030
fibroblasts