cross-mixing experiments reveal that enzymes from 48-h cells support a slightly higher level of polyphenylalanine synthesis than enzymes from 12-h cells with ribosomes from either cell type , and that the ribosomes are the primary agents responsible for the decreased efficiency of the in vito system from 48-h cells are compared with that from 12-h cells .
C0035553
ribosomes
C0007634
cells