Fig. 4.

Biological relevance of previous pressure estimations. A comparison of previous estimations (Kojic (2006), orange plus; Moriya (2008), yellow circles; Moriya (2009), green x; Breslauer (2009), blue triangle) of the pressure requirements for silk spinning in B. mori silkworms, highlighting the discrepancies between both spinning speed and pressure compared to the natural system. Although the most recent models have aligned spinning speed, the pressure remains too high. The biological extrusion domain is split into natural (d ark green dashes) and forced (pale green dashes) spinning domains