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in origin? Four plates twentynine figures
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albino Amphioxus amygdala appear base body body weight brain branches buds bulb bundle calculated cartilages cells cent cerebral cervical compared complex connection crown-heel length curve cytoplasm derived described determined diameter direction dorsal ectoderm endoderm entire evidence extend fetal fibers figure followed formation ganglia ganglion given gives growth head hemisphere increase indicated intervals jaw apparatus jaw bars lateral layers length Mean mesenchyme method midbrain month muscle nerve nervous system neural crest neural tube Norway nucleus observed olfactory organ origin pass percentage portion position posterior preparations present probably projection ratios region relation relatively represented root seen segments shown side similar spinal cord stage stained structures surface sympathetic taste tentacles terminations tion tract trunk urodeles ventral ventrolateral volume wall