Figure 4.

VJ_L rearrangements from neonatal μ⁺L⁻ bursal cells have not been selected for productive reading frame. (A) VJ_L rearrangements in neonatal μ⁺L⁺ and μ⁺L⁻ bursal cells from RCAS-Tμ-infected chicks. Short arrows along the left correspond to in-frame rearrangements (confirmed by sequencing). Arrows to the right of A correspond to the indicated positions on the scanned profiles shown in B and C. (B and C) Radioactivity from lanes marked with a ∗ in A from μ⁺L⁺ (B) and μ⁺L⁻ (C) cells was scanned by phosphoimagery. Vertical arrows at the top of B and C correspond to the positions of in-frame rearrangements.