A fetal tissue procurement company has ended its partnership with Planned Parenthood after graphic undercover videos of their practices emerged amid allegations they are illegally selling aborted organs.

Stem Express, which describes itself as a 'small life sciences company', said they cut its ties with the women's organisation due to 'increased questions' over their relationship.

The government-funded group has been accused of selling aborted tissue to research companies, an allegation they have denied.

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Terminated links: Stem Express (headquarters in Placerville, California, pictured) said they cut its ties with PLanned Parenthood due to 'increased questions' over their relationship with the women's organisation

Earlier this month, The Center for Medical Progress interviewed a former Stem Express supply technician Holly McDonnell as part of the sting operation.

The licensed phlebotomist described how she was expected to haggle women to sign a consent form to sell or donate their fetus's remains.

She reveals some of her colleagues in Fresno, California, would harvest fetuses even if they had failed to get the mother's consent.

And even women coming in for a pregnancy test would be taken aside and asked to consider surrendering their fetus. 'Pregnancy tests are potential pregnancies, therefore potential specimens,' O'Donnell said. 'So it's just taking advantage of the opportunities.'

She added that if patients decided against giving away their fetus, employees would say it was a missed opportunity.

The firm, which has strongly denied any involvement in illegal activity staid in a statement on their website: 'StemExpress at its core is a small life sciences company committed to accelerating research, advancing medicine, and saving lives.

'We partner with organizations also seeking to help researchers find solutions to some of life’s most significant medical conditions and diseases.

Damning: Earlier this month, The Center for Medical Progress interviewed a former Stem Express supply technician Holly McDonnell as part of the sting operation. The licensed phlebotomist described how she was expected to haggle women to sign a consent form to sell or donate their fetus's remains

'Our commitment to quality defines us and is demanded by our customers in the research community.

'We value our various partnerships but, due to the increased questions that have arisen over the past few weeks, we feel it prudent to terminate activities with Planned Parenthood.

'While we value our relationship with Planned Parenthood, that work represents a small percentage of our overall business activity and we must focus our limited resources on resolving these inquiries.'

The tissue taken from aborted fetuses can be used to study development, how medicines and diseases affect unborn babies, and even how they are created by the body. Vaccine development has relied on using fetal tissue for testing for close to 100 years.

Senator Rand Paul announced last month that the Senate would vote to block the $528 million in federal aid the organization receives each year before they recess.

Planned Parenthood has repeatedly denied selling fetal tissue for a profit - which is against federal law - and said the pricing discussed in these videos are related to expenses that arise from handling and transporting the samples.

Document: This is a copy of O'Donnell's gestation tracking log, showing how many fetuses of each trimester she acquired

Undercover: StemExpress' decision comes after a number of videos emerged of Planned Parenthood's practices. In this footage, two officials look for specific tissue from an aborted fetus

House Speaker John Boehner also spoke out against the organization earlier this month, saying; 'Nothing is more precious than life, especially an unborn child.

'When anyone diminishes an unborn child, we are all hurt, irreversibly so. When an organization monetizes an unborn child – and with the cavalier attitude portrayed in this horrific video – we must all act.'

The $528million in taxpayer funding received last year came in the form of government grants and contracts, plus Medicaid reimbursements.

Federal and state taxpayer funding provides more than 40 per cent of its funding.