Fig. 6. Mesodermal dorsal lip explants generate taste buds and mesodermal tissues, whereas endodermal dorsal lip explants are generally devoid of both. Mesodermal dorsal lip explants (Meso70, animal 70% of dorsal lip explant; Meso70KS, Keller sandwich Meso70 explant) typically possess taste buds (dark-gray bars), notochord (pale-gray bars) and muscle (black bars). Endodermal isolates (Endo30, suprablastoporal 30% of dorsal lip explant; Endo50, suprablastoporal 50% of dorsal lip explant; Endo30KS, Keller sandwich Endo30 explant) generally do not contain any of these tissues. A smaller percentage of 50% mesodermal explants (Meso50) generate taste buds than do the larger Meso70 explants, consistent with the inclusion of less endoderm in the Meso50 explants.