LAG3 and neoplasm: Representative coronal and axial images captured at 2, 4, 8, 20, and 24 h post‐injection revealed that LAG‐3+ A549 mice presented noticeable signal from tumor site commencing from 20 h post‐injection, peaking at 24 h, in contrast to LAG‐3− A549 mice that showed no noticeable signal at the given timepoint (Figure3a).