<｜begin▁of▁sentence｜>### Instruction:
Given the High-energy theory collaborations graph which you can read from a GML file named hep-th.gml, can you use the Mod M function in cdlib to perform community detection starting from a specific researcher represented by the vertex with ID '1'? After performing the community detection, can you generate and print a JSON representation of the detected community structure?
### Response:
import networkx as nx
from cdlib import algorithms

# Read the high-energy theory collaborations graph
G = nx.read_gml('hep-th.gml')

# Perform community detection using Mod M algorithm starting from a given vertex
coms = algorithms.mod_m(G, '1')

# Generate JSON representation of the community structure
communities_json = coms.to_json()

print(communities_json)
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