"The PD-1 checkpoint is like a stop sign for our immune system, in order to avoid autoimmune reactions and to promote self-tolerance. Despite its usefulness, in this situation, researchers have chosen to turn off the PD-1 checkpoint to activate the immune system, as mentioned before."
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.