Regulation of TGF-β family expression during axis patterning in Xenopus. Gene activation and repression in the early blastula (A) and gastrula (B). Direct activators and repressors are marked by black lines. Indirect activators and repressors, and activators and repressors without sufficient evidence to prove a direct relationship are marked by gray lines. Genes are color coded by their expression domains. References providing evidence for each relationship or expression domain are listed on the line connecting two genes or in the box with the gene name. Chd, Chordin; Dpr1, Dapper1; Ecto, Ectodermin; Fst, Follistatin; Gsc, Goosecoid; Nog, Noggin. Numbers 1 through 92 in panels A and B refer to the following references: 1, Agius et al. 2000; 2, Bae et al. 2011; 3, Branney et al. 2009; 4, Carnac et al. 1996; 5, Cha et al. 2008; 6, Cheyette et al. 2002; 7, Chiu et al. 2014; 8, de Almeida et al. 2008; 9, Dupont et al. 2005; 10, Eimon and Harland 1999; 11, Fletcher and Harland 2008; 12, Galli et al. 2003; 13, Glavic et al. 2001; 14, Gómez-Skarmeta et al. 2001; 15, Hashimoto-Partyka et al. 2003; 16, Hemmati-Brivanlou and Thomsen 1995; Hikasa et al. 2010; 17, Hoppler and Moon 1998; 18, Houston et al. 2002; 19, Houston 2012; 20, Karaulanov et al. 2004; 21, Katada et al. 2002; 22, Knochel et al. 2001; 23, Kurata et al. 2000; 24, Kuroda et al. 2004; 25, Laurent and Cho 1999; 26, Lea et al. 2009; 27, Li et al. 2015; 28, Marom et al. 1999; 29, Marom et al. 2005; 30, Martello et al. 2007; 31, Mochizuki et al. 2000; 32, Murakami et al. 2003; 33, Onichtchouk et al. 1996; 34, Onichtchouk et al. 1996; 35, Paulsen et al. 2011; 36, Reid et al. 2012; 37, Reversade and De Robertis 2005; 38, Reversade et al. 2005; 39, Rex et al. 2002; 40, Rosa et al. 2009; 41, Schneider et al. 1996; 42, Schohl and Fagotto 2003; 43, Schuler-Metz et al. 2000; 44, Sekiya et al. 2004; 45, Shieh et al. 2014; 46, Schmidt et al. 1995; 47, Sudou et al. 2012; 48, Takahashi et al. 2000; 49, Takeda et al. 2000; 50, Tanegashima et al. 2004; 51, Tao et al. 2005; 53, Trindade et al. 1999; 54, Vonica and Gumbiner 2007; 55, Wessely et al. 2001; 56, Witta and Sato 1997; 57, Xanthos et al. 2002; 58, Yamamoto et al. 2000; 59, Cho et al. 2013; 60, Plouhinec et al. 2013; 61, Maeda et al. 1997; 62, Onitsuka et al. 2000; 63, Suzuki et al. 1997; 64, Yamamoto et al. 2001; 65, Chiu et al. 2014; 66, Onuma et al. 2002; 67, Leyns et al. 1997; 68, Wills and Baker 2015; 69, Branford and Yost 2002; 70, Cheng et al. 2000; 71, Ohkawara 2003; 72, Glinka et al. 1998; 73, Chamorro et al. 2005; 74, Sander et al. 2007; 75, Nakamura et al. 2016; 76, Khokha et al. 2005; 77, Watanabe et al. 2003; 78, Rebbert and Dawid 1997; 79, Collart et al. 2005; 80, Piccolo et al. 1999; 81, Piccolo et al. 1996; 82, Zimmerman et al. 1996; 83, Schmidt et al. 1995; 84, Kofron et al. 1999; 85, Delaune et al. 2005; 86, Hyde and Old 2000; 87, Dickmeis et al. 2001; 88, Gawantka et al. 1995; 89, Hata et al. 2000; 90, Henningfeld et al. 2002; 91, Lee et al. 2002; 92, Lee et al. 2011a.