hauberk (plural hauberks) A coat of mail; especially, the long coat of mail of the European Middle Ages, as contrasted with the habergeon, which is shorter and sometimes sleeveless. 1786, Francis Grose, A Treatise on Ancient Armour and Weapons, page 14: The hauberk was a complete covering of mail from head to foot. It consisted of a hood, joined to a jacket with sleeves, breeches, stockings and shoes of double chain mail, to which were added gauntlets of the same construction.
1 Exons are expressing sequences within a pre-mRNA molecule that are spliced together once introns are removed to form mature mRNA molecules that are translated into proteins.  Alternative splicing allows for the production of various protein isoforms from one single gene coding.
RNA splicing begins with assembly of helper proteins at the intron/exon borders. These splicing factors act as beacons to guide small nuclear ribo proteins to form a splicing machine, called the spliceosome. The animation is showing this happening in real time.