Table 1.

Molecules regulating activin A activity.

	Promoting factors	References	Inhibitory factors	References
Regulatory molecules for activin A activity	TGF-β	Hübner et al., 1999	BMP	Shi et al., 2009
	EGF	Protic et al., 2017	BAMBI	Mai et al., 2014
	PDGF	Wang and Ge, 2004	glycan	Peng et al., 2015
	IL-1	Arai et al., 2011	UNK	Upton et al., 2009
	TNF-α	Kelly et al., 2016	2-macroglobulin	Asashima et al., 1991
	ARIP1/ARIP2	Liu et al., 2009; Liu H. Y. et al., 2013; Qi et al., 2013	Follistatin/follistatin-related genes	Mather, 1996; de Kretser et al., 2012

ARIP1/ARIP2, activin receptor-interacting protein 1/2; BAMBI, BMP and activin membrane-bound inhibitor; BMP, bone morphogenetic protein; EGF, epidermal growth factor; IL-1, interleukin 1; TGF-β, transforming growth factor beta; TNF-α, tumor necrosis factor alpha; PDGF, platelet-derived growth factor; UNK, uterine natural killer.