Twenty years after the introduction of the theory, we revisit what it does—and doesn’t—explain. by Clayton M. Christensen, Michael E. Raynor and Rory McDonald Please enjoy this HBR Classic. Clayton M.

The Saint Louis University Biology Department offers courses with hands-on learning opportunities from cellular structures to fish, birds, reptiles and mammals. Content below is provided by SLU ...

Humoral immunity refers to antibody-mediated immune responses. Antibodies are produced by plasma cells and protect the host from infection in three main ways: by binding to pathogens to inhibit their ...