VEGFA and neoplasm: DNA sequencing revealed that the abundant species, approximately 150 bp (Fig. 6B & C, product a) in all samples, represented a novel truncated VEGF transcript comprising exons 3, 4 and 8b, while the less abundant product, approximately 300 bp in wt tumours and heart and kidney mouse tissues (Fig. 6B, product b) corresponded to a putative VEGF164b transcript as confirmed by the presence of an exon7/exon8b junction sequence.