SAN DIEGO -- Hair and blood found in David Westerfield's motor home and blood found on his jacket almost certainly belonged to Danielle van Dam, according to three DNA experts who testified in his kidnap and murder trial Thursday.

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Much of the day's testimony was designed to teach the jury the basics of DNA and how crime laboratories study samples to make identification.

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Lewis Maddux, laboratory director of Orchid Cellmark of Germantown, Md., said his firm received DNA from a blood stain on Westerfield's jacket.

"I conclude, with a reasonable degree of scientific certainty, that the DNA came from Danielle van Dam," Maddux said.

He said the odds of another match were one in 57 quadrillion, equal to 57 plus 15 zeroes.

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Catherine Theisen (pictured, right), who examines mitochondrial DNA at the FBI crime lab, said she and an assistant studied four hairs that the San Diego Police Department sent on Feb. 14.

A hair found on a bathmat in the motor home "cannot be excluded from coming from Danielle van Dam," Theisen said.

Mitochondrial DNA, Theisen explained, is carried down from the mother's side and is primarily used to study hair, bones and teeth.

She said the sequence of DNA in the hair did not match any of 5,071 samples in the FBI database.

Defense attorney Steven Feldman got Theisen to agree that only a few of the hairs sent to the FBI lab could be tested and, of those that were, most did not point to the 7-year-old.

"With the hairs represented to you as coming from the (defendant's) SUV, you excluded Danielle van Dam?" Feldman asked.

"Yes," Theisen said.

Feldman drew a similar concession from forensic biologist Annette Lynn Peer, who not only studied the blood on the jacket, but also clippings from beneath Danielle van Dam's fingernails.

"David Westerfield is excluded from (the left fingernail)?" Feldman asked.

"That's correct," she answered.

"David Westerfield is excluded from the other hand?"

"That's correct."

Among the many observations by police that led to Westerfield being a suspect, according to previous testimony, were scratch marks on his arm.

Peer (pictured, left) testified that she was able to obtain Danielle's DNA from a pair of her underwear found in her bedroom and later from a rib bone after the child's body was recovered Feb. 27 near Dehesa.

She testified that DNA taken from a blood stain on the floor of Westerfield's motor home matched DNA taken from a blood stain on a green jacket belonging to the 50-year-old, twice-divorced father of two.

"They were the same," Peer testified.

"Were you able to calculate an estimate of how rare those matching profiles were between Danielle van Dam and the carpet stain, item 84?" prosecutor George "Woody" Clarke asked the DNA analyst.

"Yes, I was," Peer answered.

"With regard to the Caucasian population, what is the approximate likelihood of someone chosen at random from that population, having a set DNA genetic type that was found in both the carpet stain and Danielle van Dam?" Clarke asked Peer.

"That frequency would be -- in the Caucasian population -- approximately one in 130 quadrillion," she said.

Peer said that during her initial search of the defendant's motor home on Feb. 6 she lifted a blood stain from some curtains near the driver's seat.

She said a blood stain found on Westerfield's jacket was consistent with his DNA.

Earlier, police criminalist Sean Soriano (pictured, right) testified that he found four stains on the green and blue jacket, which Westerfield took to the dry cleaners Feb. 4.

Three stains tested positive for the presumptive presence of blood, the criminalist testified. They were on the front right middle, the front right shoulder and the neck portion of the jacket, he said.

The portions of the jacket where the stains were found were then cut out, packaged and sent to a lab for further DNA testing, Soriano said.

He testified that he also found blood stains on a blanket and a bean-bag chair from the victim's room.

The criminalist said he also removed two, long blond hairs from inside boxer shorts seized from the laundry room of Westerfield, who faces murder, kidnapping and misdemeanor possession of child pornography charges and could get the death penalty if convicted.

Under cross-examination by Feldman, Soriano said he didn't find any semen on bedding seized from Westerfield's residence or motor home.