Figure 2. Parotid saliva was separated on 7.5% polyacrylamide gels and transferred to nitrocellulose. Subsequently, blots were treated by periodate (P) or neuraminidase (N), columns 2 and 3, respectively. Control blots (C) remained unaffected. - = unreduced; + = reduced. After reduction, the recognition by mAb 213-6 is lost. Periodate and neuraminidase treatment abolished recognition by mAbs 213-1 and 5E9 as well as by lectin MAA. mAb 213-6 was unaffected by these treatments.