Stolfi, Alberto, Blair Gainous, John J Young, Alessandro Mori, Michael Levine, and Lionel Christiaen. (2010) 2010. “Early Chordate Origins of the Vertebrate Second Heart Field.”. Science 329 (5991): 565-8. Reference Link
Abitua, Philip Barron, Blair Gainous, Angela N Kaczmarczyk, Christopher J Winchell, Clare Hudson, Kaori Kamata, Masashi Nakagawa, Motoyuki Tsuda, Takehiro G Kusakabe, and Michael Levine. (2015) 2015. “The Pre-Vertebrate Origins of Neurogenic Placodes.”. Nature 524 (7566): 462-5. Reference Link