the addition of certain amino acid analogues ( canavanine , hydroxynorvaline , o-methylthreonine ) or a mild heat shock at 45 degrees c caused chicken embryo fibroblasts to increase rapidly the synthesis of three proteins ( molecular weights 22,000 , 76,000 and 95,000 daltons ) to levels which dominate the cells biosynthetic capacity and exceed the level of synthesis of the major cell structural proteins .
C0016030
fibroblasts
C0007634
cells