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.
In this article we will learn about the main components of a Cisco router and how the boot process takes place. Types of memory. Generally Cisco routers (and switches) contain four types of memory: Read-Only Memory (ROM): ROM stores the routerâs bootstrap startup program, operating system software, and power-on diagnostic test programs (POST). Flash Memory: Generally referred to simply as âflashâ, the IOS images are held here.