a) Schematic of the brevican protein, Bcan (top) and its deglycosylated isoform, dg-Bcan (bottom). The dg-Bcan isoform lacks the majority of N- and O-linked carbohydrates (including chondroitin sulfate chains), thus exposing specific epitopes that are masked in the glycosylated isoform. Red box denotes dg-Bcan epitope targeted for screening. b) Schematic of magnetic-activated OBOC library screen with a microfluidic sorter. c,d) Western blot analysis and immunofluorescence images showing astrocytes, U87 (empty vector) and Bcan-overexpressing U87 cells. e) Schematic of the secondary cell-based screen.