THY1 and cystic fibrosis: Reviewing the molecular signature of THY1+ and THY1− populations, which coincided with the TCF21+ and TCF21− cells, respectively, we noted that NRP1, one of the receptors for VEGFB, is mostly expressed in the THY1+ fraction (see Table 1), which could give an advantage to THY1+ cells over THY1− in CF conditions.