the results indicate that in the cockerel : ( 1 ) spontaneous lesions increase in depth and extend radially at a low constant level between 8 and 20 weeks of age and increase markedly in length between 16 and 20 weeks , ( 2 ) lesion cell proliferation is sufficient to account for the observed increase in lesion size , and ( 3 ) proliferation of lesion cells and medial cells may be governed by the same control mechanism ( s ) .
C0596290
cell proliferation
C0007634
cells