FIG. 4.

Colony edge morphologies produced by nla insertions. The nla1, nla19, nla23, and nla24 insertions were transferred into A⁺ S⁺ (DK1622), A⁻ S⁺ (DK1218), and A⁺ S⁻ (DK1253) backgrounds, and colony edges were observed using phase-contrast microscopy (×40 magnification). Photographs were taken after 5 days on CTTYE plates.