TFRC and hydrops fetalis: Some studies were focused on the surface marker of HF-MSCs such as integrin, keratin (CK14, CK15, and CK19), C8/144B, p63, CD71 and CX43 (Dong et al. 2014; Maleki et al. 2014; Son et al. 2015), CD34 (Sol et al. 2018) CD49f (Krebsbach and Villa-Diaz 2017) and CD34 and CD49f duel-positive cell residents in mice (Fontenete and Perez-Moreno 2018).