Howard Hughes Medical Institute, UC Santa Cruz, CA, USA.|Howard Hughes Medical Institute, UC Santa Cruz, CA, USA.|Howard Hughes Medical Institute, UC Santa Cruz, CA, USA.|Howard Hughes Medical Institute, UC Santa Cruz, CA, USA.|Howard Hughes Medical Institute, UC Santa Cruz, CA, USA.|Howard Hughes Medical Institute, UC Santa Cruz, CA, USA.|Howard Hughes Medical Institute, UC Santa Cruz, CA, USA.|Howard Hughes Medical Institute, UC Santa Cruz, CA, USA.