What's "mount" mean in here?

Native speaker’s answer
Rebecca
One of the meanings of "mount" is to set up, prepare, initiate, or organize something. Thus, "mount an immune response" means to "initiate/prepare an immune response." Ex: The city didn't have enough time to mount an evacuation plan before the storm hit. Ex: We didn't have a lot of time to mount a new proposal, but all worked out in the end.