and California, near Calexico and Tecate.

In Arizona, construction will focus on four areas of the border and will include the replacement of waist-high fencing meant to stop cars with 18- to 30-foot barriers that will be more efficient at stopping illegal crossings.

The government has already demolished refuge land in the Rio Grande Valley of Texas and construction is set to begin any day. On one section of the Lower Rio Grande Valley National Wildlife Refuge, crews have used heavy construction equipment to destroy a mix of trees, including mesquite, mulberry and hackberry. Those trees protect birds during the ongoing nesting season.

According to plans published last year, the cleared land will be filled in and a concrete wall will be installed, with bollards measuring 18 feet installed on top.

AfterComparative anatomy and histochemistry of human and canine latissimus dorsi muscle.
Gross and histologic studies of human and canine latissimus dorsi muscle were carried out to identify anatomic and histochemical properties that may be relevant to its use as a resource muscle, particularly for heart reconstruction. In both human and canine latissimus dorsi, three distinct muscle segments were observed, differing in direction of fibers, fiber characteristics, thickness, and blood supply. The entire canine latissimus dorsi could also be separated into superficial and deep layers, whereas only the anterolateral segment of human latissimus dorsi was separated further by the neurovascular bundle. Histochemical studies suggested significant differences between the ratios of fast to slow fibers in the superior and anterolateral segments of human muscle. Variation in size, weight, and shape within