Final answer:
The valuable cells referenced are HeLa cells from Henrietta Lacks, which are immortal and have contributed to significant medical research advances, including the development of the polio vaccine.
Step-by-step explanation:
The cells of John Moore were not specifically highlighted in the provided information; however, the reference to Henrietta Lacks and her cells suggests a similar context. The cells taken from Henrietta Lacks, known as HeLa cells, are highly valuable to researchers because they have the rare ability to divide indefinitely. This characteristic made them the first immortal human cell line, greatly benefitting medical research. Since their discovery in 1951, HeLa cells have been crucial in numerous scientific breakthroughs, including the development of the polio vaccine, advancements in cancer, AIDS, and other disease research, as well as being used in space to study the effects of zero gravity on human cells.