Review - Special Issue: Gene Expression in the Immune System
Heterogeneity in immune responses: from populations to single cells
https://www.sciencedirect.com/science/article/pii/S1471490614000520?via%3Dihub
New single cell methods enable systematic studies of heterogeneity. 
A fundamental challenge is to connect molecular variability with phenotypic diversity.
Control of adaptive immunity by the innate immune system.
https://www.ncbi.nlm.nih.gov/pubmed/25789684