In immature (1 m) IVD, RT-PCR revealed that NP cells expressed higher mRNA levels of Basp1 (8.7-fold), Ncdn (10.1-fold), Brachyury T (4-fold), CD155 (6-fold), CD221 (5.2-fold), but not Nrp-1 as compared to AF cells. This evidence concerns the gene PVR and atrial fibrillation.