On the cover: Piece (1 mm3) of a rat heart embedded in a fibrin gel and cultured for seven days under conditions of hypoxia (1% O2) and inclusion of 10 ng/ml basic Fibroblast Growth Factor. Emerging capillary-like sprouts are characterized in-gel by endothelial specific FITC-coupled lectin G. simplicifolia (green fluorescent). See related article, page 79.