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[14], 'ligament': [15], '(PDL).': [16], 'The': [17, 79, 135, 162, 187], 'purpose': [18], 'this': [20], 'study': [21], 'was': [22, 96, 101, 125, 152, 178, 192, 267], 'to': [23, 63, 216, 225, 248, 269, 285], 'determine': [24], 'effects': [26], 'epidermal': [28], 'growth': [29, 34, 73, 93], 'factor': [30, 35, 94], '(EGF)': [31], 'and/or': [32, 61], 'nerve': [33], '(NGF)': [36], 'vitro': [38], 'on': [39, 245], 'these': [40], 'functions': [41], 'MER': [43, 111, 141, 168, 195, 223, 246, 258], 'cells.MER': [44], 'from': [46, 214], 'porcine': [47], 'PDL': [48], 'were': [49, 75, 283], 'incubated': [50], 'for': [51, 83, 114, 146, 173, 200, 263], '3': [52, 174, 201, 215], 'or': [53, 175], '9': [54, 115, 147, 176, 203, 217], 'h': [55, 116, 148, 177, 204, 218], 'after': [56], 'addition': [58], 'EGF': [60, 172, 221, 231], 'NGF': [62, 118, 145, 199, 243, 292], 'final': [64], 'concentrations': [65], '10': [67], 'ng/mL.': [68], 'Cells': [69], 'cultured': [70], 'without': [71], 'those': [72], 'factors': 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