Which marker is used to denote B Cells apart from anti-lambda?

The correct choice, anti-kappa, is a specific marker used to identify B cells, particularly in the context of differentiating subsets of B cells within the immune system. B cells can express different immunoglobulin light chains, primarily kappa or lambda. The presence of kappa light chain on B cells serves as a hallmark of their lineage.

When assessing B cell populations, especially in the diagnosis of conditions like B-cell acute lymphoblastic leukemia or various types of lymphoma, using anti-kappa in conjunction with anti-lambda helps in determining the clonal nature of the B cell population. Essentially, if a population predominates in either kappa or lambda light chain expression, it suggests that these cells are likely derived from a single precursor or clone.

In contrast, CD34 is a marker primarily associated with hematopoietic stem cells and early progenitor cells rather than mature B cells. CD33 is mainly expressed on myeloid cells and is not relevant for identifying B cells. CD2 is a T cell marker and similarly does not serve in the identification of B cells. Thus, anti-kappa is the appropriate choice for denoting B cells alongside anti-lambda, as it directly pertains to the classification and understanding of B cell characteristics.