English to Spanish Medical Medical: Pharmaceuticals psychiatric drugs

Hola nuevamente a todos: Siguiendo la misma línea de preguntas anteriores, en esta oportunidad necesito saber si "ligand" es efectivamente "ligando" y cómo lo interpreto con la palabra "label" en los ejemplos que aparecen a continuación.
Muchísimas gracias a todos
Julia

"As studied by ligand binding methods, there is an apparent increase in numbers of receptors in the corpus striatum and nucleus accumbens (projection areas for dopaminergic neurons)."

“They used the relatively specific D2 blocker, 11C raclopride, to obtain an image of the distribution of D2 receptors in the brain, since these receptors were labeled by the 11C raclopride ligand.”

"In dose-response studies the 11C-labeled raclopride ligand is injected prior to treatment, giving a picture of the distribution and number of D2 receptors."