CCR2 and hydrops fetalis: Concerning CCR2 and CX3CR1 chemokines, known to be differentially expressed according to cell subsets, we observed that the expression of CCR2 within conventional monocytes increased significantly after HF to be maximal in the post-operative period (MFI 849 [637–1,211] vs. 442 [248–728], p = 0.002) (Figures 1J,L) and this trend is the same whatever the monocytes subset (Supplementary Figures 1A,B).