Wiley-Liss, New York 1991, p. 13, ISBN 0-471-56224-6* W. Jakob, S. Sagasser, S. Dellaporta, P. Holland, K. Kuhn, B. Schierwater: "The Trox-2 Hox/Para Hox gene of "Trichoplax" (Placozoa) marks an epithelial boundary."
Wiley-Liss, New York 1991, p. 13, ISBN 0-471-56224-6* W. Jakob, S. Sagasser, S. Dellaporta, P. Holland, K. Kuhn, B. Schierwater: "The Trox-2 Hox/Para Hox gene of "Trichoplax" (Placozoa) marks an epithelial boundary."