Immunoglobulin A only weakly. IgA exists in two isotypes, IgA1 and IgA2. They are both heavily glycosylated proteins. While IgA1 predominates in serum (~80%), IgA2 percentages are higher in secretions than in serum (~35% in secretions); the ratio of IgA1 and IgA2 secreting cells varies in the different lymphoid tissues of the human body: Both IgA1 and IgA2 have been found in external secretions like colostrum, maternal milk, tears and saliva, where IgA2 is more prominent than in the blood. Polysaccharide antigens tend to induce more IgA2 than protein antigens. Both IgA1 and IgA2 can be in membrane-bound form. ("see B-cell receptor")
Form W-2 this type of phishing scheme, but successfully identified it as a phishing attack and published a press release identifying this new type of attack. Those in the cybersecurity industry categorize this phishing scheme as a type of CEO Fraud, while the FBI’s Criminal, Cyber, and International Operations Divisions classify it as a type of "business email compromise" or BEC. The British-Irish equivalent form to a W-2 is a P60. The Canadian equivalent is called a T4. The Israeli equivalent is called a 106 form. The Russian equivalent is called 2-NDFL form. It can be compared to Form 16 as per