In order to assess the direct selective impact of ECH myeloid cells on adult cardiomyocyte hypertrophy, we immunoselected CD45+ leukocytes from control, ECH and HF hearts (iso-infused mice) and only kept adherent (non-lymphocyte) CD45+ cells comprising an averaged 64.2 ± 3.5% CD64+ cell number (n = 10). The gene discussed is FCGR1A; the disease is hydrops fetalis.