Aclaris Therapeutics Inc. has gained IND clearance from the FDA for ATI-052, a bispecific anti-thymic stromal lymphopoietin (TSLP)/interleukin-4 receptor (IL-4R) monoclonal antibody being developed to treat certain immuno-inflammatory diseases. A phase Ia/Ib trial, including a proof-of-concept portion in an undisclosed indication, will begin in the current quarter.