Instruct: Identify the main category of Biorxiv papers based on the titles
Query: Simultaneous Brain, Brainstem and Spinal Cord pharmacological-fMRI reveals endogenous opioid network interactions mediating attentional analgesia
7
The categories of this paper are: ecology
21
The categories of this paper are: toxicology
16
The categories of this paper are: microbiology
8
The categories of this paper are: genomics
17
The categories of this paper are: molecular
11
The categories of this paper are: cognition
23
The categories of this paper are: immunology
15
The categories of this paper are: developmental
9
The categories of this paper are: synthetic
3
The categories of this paper are: evolutionary
14
The categories of this paper are: biophysics
5
The categories of this paper are: cell
22
The categories of this paper are: physiology
27
The categories of this paper are: pathology
12
The categories of this paper are: behavior
18
The categories of this paper are: systems