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. Author manuscript; available in PMC: 2013 Sep 9.

Published in final edited form as: Expert Rev Mol Med. 2011 Jan 31;13:e3. doi: 10.1017/S1462399410001730

Immunogold-labeled electronmicrograph of E. chaffeensis TRP47 illustrating differential expression and secretion associated with morulae containing dense-cored (DC) (0.4 to 0.6 μm in diameter) morphological forms compared with reticulate cell (RC) forms (0.4 to 0.6 μm by 0.7 to 1.9 μm). RC and DC can be distinguished by two differentially expressed tandem repeat containing surface proteins, TRP47 and TRP120 that are found only on DC ehrlichiae (Refs. 22,27). The intramorular space in some morulae contains a fibrillar matrix of ehrlichial origin (Refs. 105). (Reproduced with permission from the American Society for Microbiology, license 2499420679397).

Immunogold-labeled electronmicrograph of E. chaffeensis TRP47 illustrating differential expression and secretion associated with morulae containing dense-cored (DC) (0.4 to 0.6 μm in diameter) morphological forms compared with reticulate cell (RC) forms (0.4 to 0.6 μm by 0.7 to 1.9 μm). RC and DC can be distinguished by two differentially expressed tandem repeat containing surface proteins, TRP47 and TRP120 that are found only on DC ehrlichiae (Refs. 22,27). The intramorular space in some morulae contains a fibrillar matrix of ehrlichial origin (Refs. 105). (Reproduced with permission from the American Society for Microbiology, license 2499420679397).