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To Be or Not to Be a Flatworm: The Acoel Controversy

Figure 5

Piwi-like gene expression in an acoel and a rhabditophoran flatworm.

In situ hybridizations of adult animals. (A) Isodiametra pulchra (Acoela), (B) Macrostomum lignano (Rhabditophora). Expression of piwi-like genes in the germ line and somatic stem cells. Note the lack of Ipiwi1 (A) and Macpiwi (B) expression in the epidermis. Insets: details of the epidermis, encompassed by dotted lines. Accession numbers: Ipiwi1 AM942741, Macpiwi AM942740. Scale bar is 100 µm.

Figure 5