Early in the 4 vs Early at the 4

Some examples from the web:

• A signal from P2 to EMS early in the 4-cell stage (curved arrow) polarizes EMS such that the potential to produce endoderm is acquired by only the E daughter of  ...
• Projects are selected early in the 4-H year when enrollment sheets are filled out. Check with your county to find out registration due dates and when enrollment ...
• So early in the 4th Century, the Roman Catholic Church, which was the dominant church in Europe, adopted the holiday and tried to convert into a Christian ...
• Quality Assurance sessions are scheduled for early in the 4-H year as this information is valuable for Jr Fair exhibitors to properly care for their animals.

Some examples from the web:

• Sep 1, 2014 ... Interestingly, the timing of phase transition was early (at the 4-leaf stage) in Type II exe mutants under both SD and LD conditions. Flag-leaf ...
• Apr 26, 2015 ... The rain fell early at the 4th running of the Limestone 100 GNCC, but that didn't stop the riders from battling it out all afternoon.
• Sep 2, 2011 ... Miriam finishes the run early at the 4 mile mark with an exit speed of 234.6 mph. The record is an average of two runs on successive days.
• Apr 16, 2015 ... While Keseley got the Americans going early at the 4-minute mark, the Belarus snipers quickly took over, giving them a surprising 3-0 lead in ...