Fig. 5. The force driving proximal streaming appears to be generated close to or within the enlarging oocytes. Drops of mineral oil (yellow) were injected into different areas of the C. elegans gonad. (A,D,G) DIC image. (B,E,H) 2-minute particle tracks. (C,F,I) summary diagrams. (A-C) Blocking the early pachytene area results in normal proximal streaming. (D-F) Particle movement after injection of an oil drop between the late pachytene area and loop. (G-I) An oocyte was damaged by injecting a small mineral oil droplet directly into it (red arrowhead). Scale bars: 30 µm.