Cᴏʟʟᴀɢᴇɴ /ˈᴋɒʟəᴅʒɪɴ/ ɪs ᴛʜᴇ ᴍᴀɪɴ sᴛʀᴜᴄᴛᴜʀᴀʟ ᴘʀᴏᴛᴇɪɴ ɪɴ ᴛʜᴇ ᴇxᴛʀᴀᴄᴇʟʟᴜʟᴀʀ sᴘᴀᴄᴇ ɪɴ ᴛʜᴇ ᴠᴀʀɪᴏᴜs ᴄᴏɴɴᴇᴄᴛɪᴠᴇ ᴛɪssᴜᴇs ɪɴ ᴛʜᴇ ʙᴏᴅʏ. As ᴛʜᴇ ᴍᴀɪɴ ᴄᴏᴍᴘᴏɴᴇɴᴛ ᴏꜰ ᴄᴏɴɴᴇᴄᴛɪᴠᴇ ᴛɪssᴜᴇ, ɪᴛ ɪs ᴛʜᴇ ᴍᴏsᴛ ᴀʙᴜɴᴅᴀɴᴛ ᴘʀᴏᴛᴇɪɴ ɪɴ ᴍᴀᴍᴍᴀʟs,[1] ᴍᴀᴋɪɴɢ 25% ᴛᴏ 35% ᴏꜰ ᴛʜᴇ ᴡʜᴏʟᴇ-ʙᴏᴅʏ ᴘʀᴏᴛᴇɪɴ ᴄᴏɴᴛᴇɴᴛ.
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