Having cast around for other routes, Histogen Inc. is throwing in the towel, its board having adopted a shutdown plan that includes the distribution of remaining cash to stockholders after a wind-down of operations. One of the company’s West Coast peers, Kinnate Biopharma Inc., had news, too. The firm disclosed the layoff of 70% of its workforce, including all employees at the Shanghai-based subsidiary Kinnjiu Biopharma Inc., leaving the outfit with 28 full timers.