In HF, the density of c-Fos-ir cells was significantly higher in the BIN group compared to the RES (t(20) = 2.367, p = 0.028), to the LES (t(20) = 4.381, p < 0.001) and to the BASE (t(20) = 2.818, p = 0.011) groups. The gene discussed is FOS; the disease is hydrops fetalis.