Fig6I. [doi:10.1002/dvdy.21597] Copyright: This image is from Ferrer-Vaquer A; Maurey P; Werzowa J; Firnberg N; Leibbrandt A; Neubuser A, "Expression and regulation of HTRA1 during chick and early mouse development." Dev Dyn 2008; 237: 1893-900. Reprinted with permission of Wiley-Liss Inc. [PMID:18570253] .