Palo Alto-based SyStemix Inc. said Linda Sonntag...

Palo Alto-based SyStemix Inc. said Linda Sonntag is resigning as president and chief executive, effective in December. Her replacement has not yet been named.

Sonntag will remain a board member and serve as a consultant to the company.

SyStemix is engaged in the development of cellular and gene therapy products based on human hematopoietic stem cells and progenitors.