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Fig. 4. Growth changes for each lumbar vertebra were normalized for general body
enlargement using the ratio of L#/ZA for the eight vertebra (#=1-8) and
(L1-L8)/ZA for the total lumbar spinal column, which includes intervertebral
spaces. The ratios were calculated using the beginning and ending vertebrae
and zygomatic arch (ZA) values to derive the percentage change over time. The
results are reported for the three breeding females (02-02, 02-04 and 02-05),
the nonbreeding female (02-13) and the breeding male (02-01).