According to the text, while Matthew Meselson and Franklin Stahl provided the experimental proof for semi-conservative DNA replication in prokaryotes (E. coli) in 1958, it was Taylor and his colleagues who performed similar experiments on Vicia faba (faba beans) in 1958 involving the use of radioactive thymidine. Their experiments proved that the DNA in chromosomes (eukaryotes) also replicates semi-conservatively .