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Chronic lymphocytic leukemia (CLL) is a type of cancer that affects the blood and bone marrow. [8] [9] In CLL, the bone marrow makes too many lymphocytes, which are a type of white blood cell. [8] [9] In patients with CLL, B cell lymphocytes can begin to collect in their blood, spleen, lymph nodes, and bone marrow.
The key factor that distinguishes low-count CLL/SLL-MLB, high-count CLL/SLL-MLB, and CLL/SLL is the number of circulating monoclonal B cells, as described above. However, the other MLB phenotypes may progress to and/or be mimicked by various monoclonal B-cell lymphocyte malignancies.
CLL/SLL is the most common adult leukemia in Western countries, accounting for 1.2% of the new cancers diagnosed each year in the United States. It usually occurs in older adults (median age at diagnosis 70) and follows an indolent course over many years. [11] About 1-10% of CLL/SLLs develop a Richter's transformation at a rate of 0.5–1% per ...
Migrating birds like, Swainson's thrushes can have half the brain sleep with the other half awake. Dolphins, whales, Amazonian manatee and pinnipeds can do the same. Called unihemispheric slow-wave sleep. [113] Brood parasitism, laying eggs in the nests of birds of other species, happens in types of birds that are not closely related. [114]
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The evolution of biological complexity is one important outcome of the process of evolution. [1] Evolution has produced some remarkably complex organisms – although the actual level of complexity is very hard to define or measure accurately in biology, with properties such as gene content, the number of cell types or morphology all proposed as possible metrics.
Hummingbirds and ornithophilous (bird-pollinated) flowers have evolved a mutualistic relationship. The flowers have nectar suited to the birds' diet, their color suits the birds' vision and their shape fits that of the birds' bills. The blooming times of the flowers have also been found to coincide with hummingbirds' breeding seasons.
A band that is typically made out of aluminum, or coloured plastic is attached to the leg of the bird. Each band has a unique identification code so that when birds are later recaptured, individuals can be identified. [2] Mist-nets became widely available in the early 1950s, which dramatically increased the recovery of marked birds.