12.2 Origins can be mapped by autoradiography and electrophoresis Figure 12. 4 The replication eye becomes larger as the replication forks proceed along the replicon. Note that the eye becomes larger than the nonreplicated segment. The two sides of the eye can be defined because they are both the same length. Photograph kindly provided by bernard Hirt 消当Figure 12.4 The replication eye becomes larger as the replication forks proceed along the replicon. Note that the "eye" becomes larger than the nonreplicated segment. The two sides of the eye can be defined because they are both the same length. Photograph kindly provided by Bernard Hirt. 12.2 Origins can be mapped by autoradiography and electrophoresis