these findings indicate that juvenile pernicious anemia is a heterogeneous group of disorders whose similar clinical expression might be caused by ( a ) inadequate synthesis of if , ( b ) a block in if secretion , ( c ) the secretion of an abnormal if that does not bind to cobalamin , or ( d ) the secretion of other abnormal ifs that could contain a number of other functional defects .
C0002892
pernicious anemia
C0042845
cobalamin