"And you might think about the primordial chordamesoderm.".    From Wordnik.com.  [Analog Science Fiction and Fact]

"As for the elixir vitae," Pearce said, "it is more complicated than I thought, not only the gamma globulins but the stem cells and maybe primordial chordamesoderm.    From Wordnik.com.  [Analog Science Fiction and Fact]