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3200 Phaethon (/ ˈ f eɪ. ə ˌ θ ɒ n /; previously sometimes spelled Phæton), provisionally designated 1983 TB, is an active [8] Apollo asteroid with an orbit that brings it closer to the Sun than any other named asteroid (though there are numerous unnamed asteroids with smaller perihelia, such as (137924) 2000 BD 19). [9]
Since 21-hydroxylase activity is not involved in synthesis of androgens, a substantial fraction of the large amounts of 17α-hydroxypregnenolone is diverted to synthesis of DHEA, androstenedione, and other androgens of adrenal origin beginning in the third month of fetal life in both sexes. [164]
Apical dominance occurs when the shoot apex inhibits the growth of lateral buds so that the plant may grow vertically. It is important for the plant to devote energy to growing upward so that it can get more light to undergo photosynthesis.