<p>Whole mount in-situ hybridisation showing developmental expression of <i>M-cadherin</i> (A1-A4), <i>N-cadherin</i> (B1-B4), <i>R-cadherin</i> (C1-C4) and <i>T-cadherin</i> (D1-D4) in the lymph heart as indicated by red arrow. The expression of <i>M</i>, <i>N</i>, and <i>R</i>, and <i>T-cadherin</i> was detected as early as HH30 and only <i>M-cadherin</i> was expressed at HH38.</p