Sentences with phrase «change in each cell until»

Not exact matches

Thus, in principle, a successful vaccine has to stimulate the first B cells in this lineage and then coax them along a fairly narrow evolutionary path until they have changed enough to provide effective protection against HIV.

Although the blood disorder sickle - cell anemia was first described for medical science early in the 20th century, it was not until 1956 that researchers pinpointed its cause: a single change in a nucleotide in the gene that codes for the oxygen - carrying molecule hemoglobin.