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Seasonal Breeder
an animal that produces offspring only during particular times of year.
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SERM
Selective Estrogen Receptor Modulator, such as tamoxifen, which exhibits tissue-selective effects.
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Sexual Differentiation
the process by which a developing individual assumes the characteristics of either a male or a female.
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Sexual Dimorphism
having two distinct forms (e.g., differences in shape, size, coloring) of individuals within the same species, based on the gender of the individual.
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Steroid
molecule synthesized from cholesterol.
contains cyclopentenoperhydrophenanthrene
nucleus.
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Stilbene
an aromatic hydrocarbon (C14 H12), produced by plants, often used as a phosphor and in making dyes.
backbone structure of several compounds with estrogenic activity (e.g., DES, resveratrol).
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Stimulatory hormone
a chemical released from the pituitary gland that elicits a response in a target organ.
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System
orderly, interconnected parts.
must be defined by a modifier (e.g., endocrine system).
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Testis
male gonad.
produces sperm and hormones (testosterone) necessary for reproduction.
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