D Amino Acids = DAA:

DAA are protein and hetero.

isDAA() defined in jcontrol.js.

hydrophobicDAA, polarDAA, allDAA are selectable strings of DAA names (scripts.js)

~d_aas, ~d_aas_ca (scripts.js)

Dipeptides of DAA are included in ~dipeptides and reported as such under Ligands+
and NSR, example 8g82.