Before revision:   I detail a possible scenario involving actin/myosin layers in snails (and in  C. elegans ), and outline other mechanisms which might govern handedness in eukaryote cell motility and in plants .
After revision:  I detail a possible scenario involving actin/myosin layers in snails (and in C. elegans , and also one about the microtubule layer in plant cells. I also survey the other examples that I am aware of, such as the emergence of handedness such as the emergence of handedness in neurons, in eukaryote cell motility and in plants .