This invention relates to the production and genotyping of mice lacking both Angiopoietin 1 and Angiopoietin 2. This invention also relates to the use of Tie2 receptor activation for treatment of open angle glaucoma, congenital glaucoma and cystic kidney disease, and more specifically to the use of angiopoietin 1 recombinant proteins, peptides, VE-PTP phosphatase inhibitors, and Tie2- peptomimetics to improve lymphatic drainage in the Schlemm's canal and corneal limbal lymphatic system for open angle glaucoma and congenital glaucoma patients, and to slow and/or reduce the growth of cysts in patients with cystic kidney disease.
