“…The precise characteristics of the DM of EGT have not yet been specified in the literature. Direct membrane continuities between the ER and the GC have been described many times (Flickinger, 1969, 1973; Claude, 1970; Maul and Brinkley, 1970; Bracker et al, 1971; Holzman, 1971; Morre et al, 1974; Franke and Kartenbeck, 1976; Novikoff and Yam, 1978; Uchiyama, 1982; Broadwell and Cataldo, 1983; Sasaki et al, 1984; Lindsey and Ellisman, 1985; Williams and Lafontane, 1985; Lockhausen et al, 1990; Krijnse-Locker et al, 1994; Sesso et al, 1994; Mironov et al, 2017; also reviewed in Mironov and Pavelka, 2008). These observations were based on high voltage electron microscopy (Lindsey and Ellisman, 1985), scanning electron microscopy (Tanaka et al, 1986), three-dimensional reconstruction of serial sections (Sesso et al, 1994), functional analysis of transport (Krijnse-Locker et al, 1994), and electron microscopy tomography (Ladinsky et al, 1999).…”