Schematic diagram of the OB, given the composition described above, and known thermodynamic behaviour [29, 61] of amphiphilic proteins, lipids and triglycerides. A Neutral surface [61] of the monolayer of the OB; b oleosin; c, triglyceride matrix (one molecule shown for clarity); d, phospholipid. Scale: the lipid molecules (d) are 1.8–2.0 nm long [12], and the oleosin helix that extends into the triglyceride matrix is 12 nm long [29]. NB the length of the lipid molecules represents around 0.1 % of the width of the organelle itself