PLTP and infection: Lowe et al.10 demonstrated that maize leaf transformation using Nos::Wus2 and Ubi::Bbm initiates weak embryogenic callus that barely develops within the first two weeks after infection (Table 1, PHP81858), and the use of Axig1::Wus2 and Pltp::Bbm, although leading to strong transient expression in leaf explants, did not result in subsequent somatic embryo formation (Table 1, PHP83652).