THY1 and neoplasm: We induced npp tumours in Thy1 YFP-16 reporter mice (hereafter Thy1-YFP), in which a subset of neurons are labelled with YFP allowing detailed histological analysis of axons28, and measured the YFP intensity as a readout of axonal integrity in the tumour ipsilateral striatal region, which contains the tumour bulk in most terminal lesions (Fig. 1a).