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Flight feather

Flight feather (Milvus milvus) in flight, showing remiges and rectrices Flight feathers are the long, stiff, asymmetrically shaped, but symmetrically paired feather s on the wing s or tail of a bird ; those on the wings are called remiges (singular remex) while those on the tail are called rectri more

Chagas disease

Chagas disease Chagas' disease (also called American trypanosomiasis) is a human tropical parasitic disease which occurs in the Americas , particularly in South America . Its pathogen ic agent is a flagellate protozoa n named Trypanosoma cruzi , which is transmitted to humans and other mammal more

Nicotinamide adenine dinucleotide

Nicotinamide adenine dinucleotide Nicotinamide adenine dinucleotide, abbreviated NAD+, is a coenzyme found in all living cell s. The compound is a dinucleotide, since it consists of two nucleotide s joined through their phosphate groups: with one nucleotide containing an adenosine ring, and the more

Myxobolus cerebralis

Myxobolus cerebralis Myxobolus cerebralis is a myxosporea n parasite of salmonid s (salmon , trout , and their allies) that causes whirling disease in farmed salmon and trout and also in wild fish populations . It was first described from rainbow trout in Germany a century ago, but its range ha more

Tooth development

Tooth development Tooth development is the complex process by which teeth form from embryo nic cells , grow , and erupt into the mouth . Although many diverse species have teeth, non-human tooth development is largely the same as in humans. For human teeth to have a healthy oral environment, more

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