Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Examples of IS6110 inverse-PCR profiles of M. tuberculosis strains from China (a), Vietnam (b), Bulgaria (c), and Russia (d). Bj, Beijing genotype strains; ancient Beijing strains are also marked by an asterisk. M, 100-bp DNA ladder. Arrows indicate the PCR fragments specific for the Beijing genotypes (two- or three-band profile).
