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Fig. 4. AGM CD41:eGFP⁺ cells seed the thymus to become rag2⁺ thymocytes. (A) Upper left panel shows one CD41:eGFP⁺ cell immediately after rhodamine uncaging at 40 hpf (arrowhead). Ten cells were uncaged per embryo, and thymic lobes (areas within broken lines in lower panels) were analyzed at 4 dpf. Rhodamine⁺ cells were observed in the thymic lobes, along with GFP⁺ cells that were not uncaged (lower left panel). Control animals where regions outside of the AGM were laser uncaged never showed rhodamine⁺ thymic cells (right panels). (B-D) Similar uncaging experiments using CD41:eGFP, Rag-2:eGFP double transgenic animals show labeled thymic immigrants are lymphoid. (B) CD41:eGFP⁺ cells were laser targeted at 40 hpf in the AGM and thymi analyzed at 5 dpf, when thymic cells no longer express the CD41 transgene (left panel; asterisks mark circulating CD41⁺ thrombocytes) and when nascent thymocytes robustly express the rag2 transgene (right panel). (C) Targeted CD41:eGFP⁺ cells migrate to the thymus and express the rag2 transgene. Left panel shows GFP expression in a representative thymic lobe, middle panel clones of rhodamine⁺ cells and right panel a merged imaged, including Nomarski overlay. (D) Confocal imaging of targeted thymic immigrants. Left panel shows a maximum projection of the entire thymic lobe, and shows a rhodamine⁺ GFP^- cell migrating (arrowhead) into the thymus via a posterior thymic duct (arrow). Right panel shows a single z-slice through the thymus showing expression of GFP and rhodamine. All embryos oriented dorsal side upwards, anterior towards the left.

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