Fragments of blood linked to Stephen Lawrence were found in an evidence bag containing the jacket of one of the men accused of his murder, a court has been told.
Forensic scientist Edward Jarman told a jury at the Old Bailey that the three fragments had a chance of less than one in a billion of not being Mr Lawrence's blood.
He also discovered a fragment of blood from the evidence bag containing Gary Dobson's jacket that encased three textile fibres, which, he told the court, meant the blood was wet when it came into contact with them.
Scientists could not get a full profile from this for DNA testing, but from a partial profile found it had a probability of less than one in a billion of not belonging to Mr Lawrence.
These discoveries were made when a team from a company called LGC were asked to carry out a cold case review of Mr Lawrence's murder.
Dobson, 36, and David Norris, 35, are accused of being involved in the gang attack that killed Mr Lawrence in Eltham, south-east London in April 1993, which they deny.
The court also heard that a tiny bloodstain matching Mr Lawrence's DNA to the same probability was found on the collar of Dobson's jacket.
The stain, which measured 0.5mm by 0.25mm, was discovered when the entire jacket was examined using a microscope.