Intercellular junctions of the vitelline cells in Sanguinicola sp. 1 from pike. (A) Between two maturing vitelline cells, note the short cytoplasmic extension of both cells at the contact point. Scale bar = 2 μm. (B) Between two vitelline cells at an early stage of maturation, note the different kinds of pseudopodia-like extensions of the surface cytoplasm. Scale bar = 1 μm. (C, F) Detail of the junctions. Scale bars = 0.5 μm. (D) Between an immature vitelline cell and muscle fibres, note the long cytoplasmic extension of the vitelline cell at the contact point. Scale bar = 1 μm. (E) Between immature vitelline cells. Scale bar = 2 μm. (G) Between maturing vitelline cell and muscle fibres. Scale bar = 1 μm. (H) Vitelline clusters filled with vitelline globules. Scale bar = 1 μm. (I) Heterogeneous contents of the vitelline globules. Scale bar = 0.5 μm. Abbreviations: ca = central area of vitelline globule, cj = cell junction, g = vitelline globule, gc = globular cluster, mc = muscle cell, mf = muscle fibres, pe = pseudopodia-like extension, r = lucid rim of vitelline globule, vc = vitelline cell.