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Expression of peptide transporter PepT1 and sodium glucose transporter SGLT1 mRNA in chicken yolk sac tissue. PepT1 (A) and SGLT1 (B) mRNA were detected in formalin-fixed, paraffin embedded yolk sac (YS) tissue at embryonic days 15 and 19, respectively by RNAscope in situ hybridization and revealed as red dots (Wang et al., 2012). Tissues were counterstained with hematoxylin (Zhang and Wong (2017) and Zhang et al. (2019)).
