W lineage variant

The descendants of the W precursor cell exhibit any variation in developmental programs compared to their counterparts in control animals.

D lineage variant

The descendants of the D blastomere exhibit any variation in developmental programs compared to their counterparts in control animals.

aberrant posteriorly-directed neurite

Any neurite that is extended towards the posterior of the animal from neurons that in wild-type animals make only anterior projections (e.g. D-type neurons in C. elegans).