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Fig. 4. Influence of nHA content on swelling behaviour of CMC-AM/nHA-CS and CMC-AM/nHA-CS hydrogels: (a and a1) swelling ratio, (b and b1) time/swelling ratio (T/S) and time (T), (c and c1) log S and log T and (d and d1) S and T1/2 graph of nHA based CMC-AM hydrogels.