Complex sentence: Nikola Pavletich later crystallized the DNA-binding domain of p53 with the DNA binding site and showed that p53 amino acid residues involved in mutations in human cancer normally touch the DNA binding site recognized by the p53 protein.
Split into simpler sentences: Nikola Pavletich later crystallized the DNA-binding domain of p53 with the DNA binding site. This work showed that p53 amino acid residues involved in mutations in human cancer normally touch the DNA binding site recognized by the p53 protein.