X20
X20
 		2L40
2L40
 2L40-2R41
2L40-2R41
 		2R41
2R41
 		3L80
3L80
 3L80-3R81
3L80-3R81
 		3R81
3R81
central div.
Central divisions
The figures 'X20, 2L40 and 3R81' are reproduced with permission of Hereditas
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