Interference with the deterministic branch of the lineage affects lineage progression. We find that neurogenic progenitor divisions produce two daughter cells, one of deterministic and one of probabilistic fate. To fill this gap, we here follow the fate outcome of single neurogenic progenitors in the zebrafish retina over time using live imaging. While the output of progenitor differentiation is well investigated at the population and clonal level, how stereotypic or variable fate decisions are during development is still more elusive. Pinworms have a fairly simple life cycle with only one host.Correct nervous system development depends on the timely differentiation of progenitor cells into neurons. Adults lay eggs that pass out of the host’s body to continue the cycle. The eggs hatch and develop into adults in the host’s digestive tract. Humans become infected when they ingest the nearly microscopic pinworm eggs. In some areas, as many as one out of three children are infected. Tiny pinworms are the most common roundworm parasites of people in the U.S. Hookworms like this one are common human parasites. Adults lay eggs, which pass out of the host in feces. They migrate to the intestine, where they mature into adults. Hookworm larvae enter the host through the skin. They are named for the hooks they use to grab onto the host’s tissues. For example, hookworms, like the one in Figure below, are human parasites. Parasitic roundworms may have plant, vertebrate, or invertebrate hosts. By breaking down organic matter, they play an important role in the carbon cycle. They generally feed on bacteria, fungi, protozoans, or decaying organic matter. Free-living worms are found mainly in freshwater habitats. Roundworms may be free-living or parasitic.
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