... near the limit of detection for this interaction, assuccessive dilution of the probe soon led to loss of sig-nal. The low yields of the AP probe and of nucleolin,together with the inevitable ... [28,30,31]. Nevertheless, the potential ligand of PTPr within developing muscle of the chick embryoappears not be HSPG-related, and only interacts with the short protein isoform of PTPr expressed ... developingmuscle of the chick [37]. To identify PTPr-bindingproteins and potential ligands, an immobilized fusionprotein consisting of the first six subdomains of the PTPr ectodomain fused to...