Changes in the expression levels of elastic fibres in yak lungs at different growth stages.

The percentage of elastic fibres in the lung parenchyma showed an increasing trend (Fig. 1 d) from the 30-day-old yak to the 180-day-old yak ( P -value < 0.05), but there were no significant differences between the 1-day-old and 30-day-old yaks ( P -value > 0.05) as well as the 180-day-old and adult yaks ( P -value > 0.05).

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