“…Since F9 cells are nullipotent and thus restricted in their differentiation pathway (Strickland and Mahdavi, 1978;Hogan et al, 1983), mouse embryos were investigated at various stages of development. Specifically, using Northern analyses transient expression of Hox 1.1, Hox 1.2 (Colberg-Poley et al, 1985a,b), Hox 1.3 (M.Fibi, B.Zink, M.Kessel, A.M.Colberg-Poley and P.Gruss, in preparation), Hox 1.4 (Wolgemuth et al, 1986;Rubin et al, 1986;Duboule et al, 1986), Hox 1.5 , Hox 2.1, Hox 2.2 Jackson et al, 1985;Hauser et al, 1985;Krumlauf et al, 1987), and Hox 3.1 (Breier et al, 1986;Awgulewitsch et al, 1986) Hart et al, 1985;Awgulewitsch et al, 1986;Jackson et al, 1985;Krumlauf et al,1987). Recent work with Hox 1.5 also showed expression at day 7.5 and later in spinal cord and mesonephric kidney (Gaunt et al, 1986), as well as in spermatocytes and spermatids of adult male animals (Wolgemuth et al, 1986;Rubin et al, 1986).…”