data previously obtained indicate that , during assembly of the related bacteriophages t7 and t3 , a dna-free procapsid ( capsid i ) is produced and that subsequently capsid i : ( 1 ) binds to a longer than mature ( concatemeric ) dna and then becomes structurally altered to a particle isolated as a capsid ( capsid ii ) physically resembling the mature bacteriophage capsid more than the procapsid ( initiation phase of packaging ) , ( 2 ) draws dna to its interior ( entry phase of packaging ) , ( 3 ) participates in cutting the concatemeric dna to mature size .
C0012854
dna
C1257941
concatemeric dna