Regeneron Pharmaceuticals $REGN is having a roller coaster year. REGN Weekly Chart(click to enlarge)Support:- The weekly chart shows that price is at a key rising support.- If price would have held above 400, the market would look slightly bullish.- However, now that price is under 400 and under the 200- and 100-day simple moving averages, I think this 375-390 area will be the last line of defense before the market turns bearish.- Below 375, I think there is downside to the 2016 low around 325, as well as an extension to 300.- If price can hold above 390 this coming week, then REGN would look like a market where traders are respecting the broken consolidation that took all of 2016 and part of 2017 to develop. - We can see that a break below 375 would put price below the middle of this consolidation. Staying above the middle can be considered a bullish sign.