[3dem] Deposition of Half-maps for Certain EM Entries Now Mandatory

[Justin Flatt]

As announced previously 
(https://www.wwpdb.org/news/news?year=2021#61afa92e5f450743ba4aa438), 
deposition of half-maps for single-particle, single-particle-based 
helical, and sub-tomogram averaging reconstructions to the EM Data Bank 
(EMDB) is mandatory as of February 25, 2022. This change is in response 
to a long-standing community request to the wwPDB EMDB Core Archive and 
was also a recommendation from the 2020 wwPDB single-particle cryo-EM 
data-management workshop (white paper in preparation). Several 
recommendations from this workshop have already been implemented in the 
wwPDB OneDep system. These include improvements to wwPDB validation 
reports and enhancements for capturing metadata via the deposition 
interface.

Mandatory half-maps must be unfiltered, unmasked, unsharpened, and 
positioned in the same coordinate-space and orientation as the primary 
map such that they superimpose. The availability of half-maps will 
contribute to improved validation of EM structures as reflected in the 
wwPDB validation reports.

wwPDB strongly urges developers of cryo-EM processing software for the 
affected modalities to implement support for output of such half-maps 
(if this is not already available).

Any queries about this policy change can be directed to info at wwpdb.org.
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