- CAN cell migration variant
Variation in the migration pattern of CAN neurons. In C. elegans, CAN neurons move posteriorly from their birthplace in the head to positions near the middle of the embryo.
- dorsal nerve cord development variant
Variations in the progression of the anatomical structures that consist of processes of ventral cord motor neurons that send commissures to the dorsal side, as well as processes of certain head and tail neurons, over time from initial formation to mature structure compared to control (Wormatlas).
- head cavity
The head contains cavities, possibly indicative of inappropriate cell death.
- head degeneration
Animals exhibit visible, structural degeneration of the head, unlike control animals.
- paralyzed body
All parts of the animal are immobilized except for the head.
- light touch habituation variant
Any variation in the decreased behavioral response to repeated light head or tail touch compared to control. A gentle touch to the animal's head causes backward movement, whereas a gentle touch to the animal's tail causes forward movement. When wild-type animals are touched repeatedly on the head or tail, after some repetition they stop responding to the touch stimulus.
- shrinker
The whole body undergoes longitudinal shortening in response to head touch or tail touch (Wormatlas).