The animals produced abnormally high levels of the stress hormone, which is called corticosterone in mice.

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They also produced lower levels of the stress hormone corticosterone, which helps to regulate the impact of cytokines.

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The researchers investigated the anxiety levels of the mice by measuring a stress hormone called corticosterone in their faeces.

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Earlier research suggests that circulating levels of a potent stress hormone, corticosterone, in the female before conception or egg laying is a dominant factor.

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