Listing the same citation under 2 or more entries, known as double-posting, is helpful when readers might be expected to look equally frequently in more than one place.
benign prostatic hyperplasia (BPH)
(BPH) BPH (benign prostatic hyperplasia)
prostatic hyperplasia, benign (BPH)
[cTnC is listed in both the c’s and in the t's.]
However, for entries that will also appear in a series of related subentries under a main heading, cross-references to the principal form of entry are preferred to double-posting.
E-selectin. See under selectins
P-selectin. See under selectins Selectins