Hilum
The scar on a seed, such as a bean, indicating the point of attachment to the funiculus.
Hindgut
The caudal portion of the embryonic alimentary canal in vertebrates.
Histamine
A substance released by injured cells that causes blood vessels to dilate during an
inflammatory response.
Histone
A small protein with a high proportion of positively charged amino acids that binds to the
negatively charged DNA and plays a key role in its chromatin structure.
HIV
Abbreviation of human immunodeficiency virus, the infectious agent that causes AIDS; HIV
is an RNA retrovirus.
Holoblastic cleavage
A type of cleavage in which there is complete division of the egg, as in eggs having little yolk
(sea urchin) or a moderate amount of yolk (frog).
Holozoic
Obtaining nourishment by the ingestion of organic material, as animals do.
Holophytic
An organism that produces its own food through photosynthesis.
Hooks
A curved or sharply bent device, usually of metal, used to catch, drag, suspend, or fasten
something else.
Homeobox
A 180-nucleotide sequence within a homeotic gene encoding the part of the protein that
binds to the DNA of the genes regulated by the protein.
Homeosis
Evolutionary alteration in the placement of different body parts.
Homeostasis
The steady-state physiological condition of the body.
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