In the context of cancer, many cells are associated with both extra and missing chromosomes. And, in some cases, the cancerous cells gain or lose only part of a chromosome. Each chromosome is divided into two “arms”—a shorter arm called…

In the context of cancer, many cells are associated with both extra and missing chromosomes. And, in some cases, the cancerous cells gain or lose only part of a chromosome. Each chromosome is divided into two “arms”—a shorter arm called…