Molecular calcium-binding chaperone promoting folding, oligomeric assembly and quality control in the ER via the calreticulin/calnexin cycle. This lectin may interact transiently with almost all of the monoglucosylated glycoproteins that are synthesized in the ER (By similarity). 20 CALR_SPIOL KVFFEERFEDGWENRWVKKD Calreticulin (Fragment)