STUDIES OF THE AVIAN SHELL GLAND DURING EGG FORMATION. I. — THE EXTRACELLULAR SPACE OF LAYING HENS P. MONGIN, N. W. CARTER and Elizabeth DIETZ Ann. Biol. anim. Bioch. Biophys., 16 5 (1976) 649-654 DOI: 10.1051/rnd:19760503