A drive has been launched to encourage more donors of Afro-Caribbean and African descent to help improve the care of sickle cell disease.
NHS Blood and Transplant wants to recruit an extra 40,000 black donors.
It has joined with leaders of several churches to encourage donation.
The churches began their campaign on Sunday with a Prayer Sunday.
Campaigners, led by Rev Rose Hudson Wilkin, chaplain to the speaker of the House of Commons, have offered churches sermon notes and encouraged them to hold services on the theme of donation.
Rev Hudson Wilkin said that being a donor was part of a 'modern-day medical miracle.'
A spokesman for NHS Blood and Transplant said: 'We are asking Pastors and church leaders to make a date to donate with friends, family or a group from church, choose one of our donor centres or a local session and book your appointments.'
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