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Published online by Cambridge University Press: 03 August 2017
Spiral galaxies belonging to rich clusters are generally found to be deficient in atomic gas; this has been interpreted as being due to the ram pressure from the intracluster X-ray emitting gas or to the tidal interaction between the galaxies. However, the molecular content of spirals does not share these characteristics, at least in the Virgo cluster (Stark et al., 1986; Kenney and Young, 1989).