From Xenopus Wiki
Erythrina Cristagalli Lectin (ECL)
Vector labs FL-1141 (fluorescein conjugated).
Xenopus laevis embryo stained with fluorescein conjugated ECL (Image from P. Vize 
Stains the proximal pronephric tubules and cement gland. Somite borders also weakly stained. Can be used as a counterstain on embryos already processed via in situ hybridization.