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Table 5 SMN2 copy number in different sub-types of SMA

From: New multiplex real-time PCR approach to detect gene mutations for spinal muscular atrophy

SMA sub-types SMN2 copy number Total
2 3 4
Type I 19 (46.34) 16 (39.02) 6 (14.63) 41
Type II 8 (27.59) 11 (37.93) 10 (34.48) 29
Type III 1 (20) 2 (40) 2 (40) 5
Total 28 (37.33) 29 (38.67) 18 (24) 75