what is segmentation in metazoans?
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Many metazoans are segmented, that is, their body plan is based on the repetition of metameric units (e.g. segments in arthropods, vertebrae in vertebrates). Segments originate from the localized expression of segmentation genes in early embryogenesis.
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★彡[ꜱᴇɢᴍᴇɴᴛᴀᴛɪᴏɴ ɪꜱ ᴀ ᴄᴏᴍᴍᴏɴ ꜰᴇᴀᴛᴜʀᴇ ᴏꜰ ᴅɪꜱᴘᴀʀᴀᴛᴇ ᴄʟᴀᴅᴇꜱ ᴏꜰ ᴍᴇᴛᴀᴢᴏᴀɴꜱ, ᴀɴᴅ ɪᴛꜱ ᴇᴠᴏʟᴜᴛɪᴏɴ ɪꜱ ᴀ ᴄᴇɴᴛʀᴀʟ ᴘʀᴏʙʟᴇᴍ ᴏꜰ ᴇᴠᴏʟᴜᴛɪᴏɴᴀʀʏ ᴅᴇᴠᴇʟᴏᴘᴍᴇɴᴛᴀʟ ʙɪᴏʟᴏɢʏ. ... ꜰᴏʀ ꜱᴇɢᴍᴇɴᴛᴀᴛɪᴏɴ ᴄᴏɴᴛʀᴏʟʟᴇᴅ ʙʏ ᴀ ꜱᴛᴀᴛɪᴄ ɢʀᴀᴅɪᴇɴᴛ, ᴀꜱ ɪɴ ʟᴏɴɢ‐ɢᴇʀᴍ ʙᴀɴᴅ ɪɴꜱᴇᴄᴛꜱ, ᴀ ᴄᴀꜱᴄᴀᴅᴇ ᴏꜰ ᴀᴅᴊᴀᴄᴇɴᴛ ʀᴇᴘʀᴇꜱꜱᴏʀꜱ ʀᴇᴍɪɴɪꜱᴄᴇɴᴛ ᴏꜰ ɢᴀᴘ ɢᴇɴᴇꜱ ᴇᴠᴏʟᴠᴇꜱ.]彡★
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