FIGURE 5. 1. DNA replication FIGURE 5.1. DNA replication. The helicases, and the replication fork, are moving to the left.

FIGURE 5.2. DNA polymerase III can correct its own mistakes.

UNFIGURE 5.1.

FIGURE 5.3. Mismatch repair of DNA.

FIGURE 5.4. Spontaneous reactions corrupt the DNA database.

FIGURE 5.5. Formation of a thymine dimer in DNA.

FIGURE 5.6. Base excision repair.

FIGURE 5. 7. The human - and -globin gene family clusters FIGURE 5.7. The human - and -globin gene family clusters.  indicates a pseudogene. Adults only express , , and , and of these the expression of  is very low. The exon/intron boundaries of the -globin gene are indicated at the bottom.