Selected Reform Responsa 227
When dealing with experimental animals we should be quite certain that they are not subjected to pain or used for frivolous reasons as for example cosmetic experimentation.
A mouse engineered genetically for a specific set of experiments, which will eventually help human beings, lies within, the boundaries of utilizing animals for the benefit of human beings. Naturally the humane treatment of the animals in accordance with our tradition must be observed. It would be appropriate for Jews to be involved in this kind of genetic engineering and to use the animals that they themselves have genetically changed.
Walter Jacob