The helical and helical-reticular patterns usually show different degrees of pitch and coiling. In Fig. 4B, the helical thickenings have a single or double-helical structure with a very large pitch.
The helical and helical-reticular patterns usually show different degrees of pitchand coiling. In Fig. 4B, the helical thickenings have a single or double-helical structure with a very large pitch.