the structure and distribution of microfilaments were examined by electron microscopy in uninfected normal rat kidney ( nrk ) cells , murine sarcoma virus ( msv ) -transformed nrk cells , and nrk cells infected with a cold-sensitive transformation mutant of msv , i.e. , nrk ( msv-1b ) cells , grown at both permissive ( 39 degrees ) and nonpermissive ( 33 degrees ) temperature .
C0025979
microfilaments
C0007634
cells