Regenxbio (NSDQ:RGNX) has closed a license agreement with AbbVie (NYSE:ABBV) to develop RGX-314, a vascular endothelial growth factor inhibitor. The drug has been the focus of Phase 2 and Phase 3 trials exploring its potential in wet age-related macular degeneration (AMD) and diabetic retinopathy. AbbVie will make an upfront payment to Regenxbio of $370 million…