Sap transport proteins. Recent evidence indicates that mobile proteins and RNA are part of the plant's long-distance communication signaling system. Evidence also exists for the directed transport and sorting of macromolecules as they pass through plasmodesmata." A large number of insects of the order Hemiptera (the half-wings), feed directly on phloem sap, and make it the primary component of their diet. Phloem sap is "nutrient-rich compared with many other plant products and generally lacking in toxins and feeding deterrents, [yet] it is consumed as the dominant or sole diet by a very restricted range of animals". This apparent paradox is explained
Y Sap mine effect of the British destructive artillery bombardment and recommended blowing Y Sap mine two days early, to destroy the "Blinddarm" and prevent enfilade fire from it during the British attack. The crater could be occupied by the British infantry and used by the Royal Engineers to dig an advanced jumping-off trench for the British infantry, which would reduce the distance the British infantry would have to cross by over . Hance's superiors agreed that firing Y Sap mine early could help to neutralise enemy fire from the flanks around La Boisselle but the explosion would alert the Germans that a