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Chick chorioallantoic membrane (CAM) assay used in this study (left). Control fibrin hydrogels (upper row) and radiopaque test counterparts spiked with iodixanol (lower row) were placed in o-rings on the CAM for 7 days (from embryonic day 7 to 14), and vascularization was quantified. There was no difference between the test and the control group.
