SP7 and hydrops fetalis: Specifically, the number of osterix-positive osteoprogenitors was increased in the vehicle-treated ACLT group (91.75 ± 33.94/mm2) when compared with sham group(38.79 ± 24.09/mm2), and this effect was attenuated by HF to a level of 54.55 ± 19.51/mm2.