Fig. 1. Examples of egg cordons deposited after treatment. (A) An egg cordon produced in response to the NO donor SNAP (S-nitroso-N-acetyl-penicillamine) that began with empty egg capsules and ended with capsules filled with eggs. The eggs are filled with yolk, which is yellow. The portions of the egg cordon deposited earlier are white, reflecting the lack of yolk and eggs in the capsules. Note that both the white and the yellow portions of the cordon are knotted and raveled, reflecting identical tamping and weaving behaviors that accompany egg deposition. (B) A section of an egg cordon produced in response to BC homogenate, showing capsules filled with numerous eggs. (C–E) Sections of egg cordons laid in response to NO. (C) The cordons contain empty capsules; this is the most common appearance of the cordons. (D) At the start of egg-laying, cordons sometimes lacked capsules. (E) As deposition of a cordon similar to C progressed, eggs sometimes began to appear in some capsules. Scale bar in D is for B–E.