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Calcaneal tendon elastic moduli of HH43 chick embryos treated for 48 h (N = 5). BAPN treatment decreased modulus relative to saline controls (same saline control data as in figure 1a); 4-AP treatment increased modulus relative to saline controls (same data as in figure 1a); 4-AP+BAPN treatment reduced modulus compared with 4-AP treatment alone. (*p < 0.05, **p < 0.01.) (Online version in colour.)
