If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content
B Lymphocytes (B cells) http://www.khanacademy.org/video/b-lymphocytes--b-cells ----------------------------------------- ودورها في الجهاز المناعي B يتحدث هذا الفيديو عن خلايا ----------------------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org