in seedlings up to 10 d old , chloroplast dna replication is found in the region from 1 to 4 cm from the leaf base ( 1 ) if chloroplasts are isolated from this region of leaf and incubated in the presence of a radioactively labeled dna precursor , radioactively labeled dna can be produced in vitro .
C0598312
replication
C0012854
dna