FOS and hydrops fetalis: Also, the velocity of movement was not correlated with c-Fos expression in the investigated brain areas (HF: r = −0.099, p = 0.604; TnA: r = −0.207, p = 0.272; IMM: r = −0.215, p = 0.255; LM: r = −0.025, p = 0.895).