Top: Both X-chromosome territories are detected by FISH. Shown is a single optical section made with a confocal microscope. Bottom: Same nucleus stained with DAPI and recorded with a CCD camera. The Barr body is indicated by the arrow, it identifies the inactive X (Xi). Left: DAPI stained female human fibroblast with Barr body (arrow). Right: histone macroH2A1 staining. Arrow points to sex chromatin in DAPI-stained cell nucleus, and to the corresponding sex chromatin site in the histone macroH2A1-staining.
Usage Guidelines. Up to 16 security levels can be configured using Cisco IOS software. If such levels are configured on a system, using this command with the privilege-level option allows you to exit to a lower security level. If a level is not specified, the user will exit to the user EXEC mode, which is the default.
no shutdown. By default, a Cisco router or switch shuts down all ports, meaning the ports aren't operational. However, this is different from a device such as a Linksys router; by default, all ports of one of these devices are operational when you turn on the device. To enable ports for use, you can use the no shutdown command. This reverses the shutdown state and enables the port. Here's an example: In addition to using this command the first time you use the ports, you can also use it whenever you're having trouble with the port to bounce it. You would also use it after making extensive configuration changes to the port.