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INI-CET 2009 — Physiology

Q: ABO antigens are not found in:

CSF. ***CSF*** - ABO antigens are typically expressed on the surface of **red blood cells** and in the secretions of individuals classified as **secretors**. - **Cerebrospinal fluid (CSF)** is generally devoid of these antigens. *Semen* - ABO antigens can be found in **semen**, particularly in individuals who are secretors. - This is due to the presence of **secreted bodily fluids** containing soluble forms of these antigens. *Saliva* - **Saliva** is a well-known source of soluble ABO antigens in secretor individuals. - The presence of these antigens in saliva is often used in **forensic testing** and blood group determination. *Tears* - Similar to other bodily secretions, **tears** can contain soluble ABO antigens in secretor individuals. - This is part of the general secretion of these antigens into exocrine fluids. [Practice more Physiology PYQs on OnCourse]

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ABO antigens are not found in: