define capping ? (in zoology)
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Cᴀᴘᴘɪɴɢ ɪs ᴀ ғᴏʀᴍ ᴏғ RNA ᴘʀᴏᴄᴇssɪɴɢ ɪɴ ᴡʜɪᴄʜ ᴛʜᴇ 5' ᴇɴᴅ ᴏғ ᴛʜᴇ ɴᴀsᴄᴇɴᴛ ᴘʀᴇ-ᴍRNA ɪs ᴄᴀᴘᴘᴇᴅ ᴡɪᴛʜ ᴀ 7-ᴍᴇᴛʜʏʟ ɢᴜᴀɴᴏsɪɴᴇ ɴᴜᴄʟᴇᴏᴛɪᴅᴇ, 7-ᴍᴇᴛʜʏʟɢᴜᴀɴʏʟᴀᴛᴇ. Cᴀᴘᴘɪɴɢ ᴏᴄᴄᴜʀs sʜᴏʀᴛʟʏ ᴀғᴛᴇʀ ɪɴɪᴛɪᴀᴛɪᴏɴ ᴏғ ᴛʀᴀɴsᴄʀɪᴘᴛɪᴏɴ. Tʜᴇ 5' ᴄᴀᴘ ɪs ʀᴇᴛᴀɪɴᴇᴅ ɪɴ ᴍᴀᴛᴜʀᴇ ᴍRNAs. Cᴀᴘᴘɪɴɢ ɪs ʀᴇϙᴜɪʀᴇᴅ ᴛᴏ ᴘʀᴏᴛᴇᴄᴛ ᴛʜᴇ RNA ᴛʀᴀɴsᴄʀɪᴘᴛ ғʀᴏᴍ ᴅᴇɢʀᴀᴅᴀᴛɪᴏɴ.
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Capping is a form of RNA processing in which the 5' end of the nascent pre-mRNA is capped with a 7-methyl guanosine nucleotide, 7-methylguanylate. Capping occurs shortly after initiation of transcription. The 5' cap is retained in mature mRNAs. Capping is required to protect the RNA transcript from degradation.
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