should suggest be suggests?

Context:

"Our results show that gene therapy reagents are effective in human inner ear tissue. Taken together with the results from another group of scientists who showed that similar gene therapy compounds can produce new hair cells and restore hearing function in guinea pigs suggest that the future of gene therapy in the human inner ear is sound," Holt said.

More:
http://www.sciencedaily.com/releases/2007/06/070614082041.htm

Taken together with the results from another group of scientists who showed that similar gene therapy compounds can produce new hair cells and restore hearing function in guinea pigs suggest that the future of gene therapy in the human inner ear is sound," Holt said.

The sentence that Holt said does not make sense.

Taken together with ... bla bla bla, [some things] suggest that bla bla bla.

But the [some things] are missing. Probably the word "they".

It may have got hacked about by somebody in editing.