| Type | MGI:General | Description | abnormal cutaneous maximus muscle at E12.5 with reduced size, ill-defined anterior limits and ectopic myoblast migration into areas traditionally devoid of muscle cells ectopic myoblasts or disoriented single myoblasts in the shoulder region (e.g. spinotrapezius muscle) at E12.5 severe reduction in cutaneous maximus thickness in presymptomatic mice abnormal myofibre orientation in the cutaneous maximus and rhomboid muscles in presymptomatic mice ectopic muscles share tendon attachments sites with existing muscles in presymptomatic mice |