Use of lead shields for radiation protection of superficial organs in patients undergoing head CT examinations
Molecular phylogeny of the Aglajidae head-shield sea slugs (Heterobranchia: Cephalaspidea): new evolutionary lineages revealed and proposal of a new classification
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1 The term sometimes applied to the cephalon in trilobites (Trilobita).
2 The dorsal head covering of solid bone which occurs in many ostracoderms (Ostracodermi) (agnathan fish, see agnatha).
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